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==Overview==
==Overview==


'''Solitary pulmonary nodule (SPN)''' is defined as a relatively well defined round or oval pulmonary parenchymal lesion equal or smaller than 30 mm in diameter. Solitary pulmonary nodule is usually surrounded by pulmonary parenchyma and/or visceral pleura and is not associated with lymphadenopathy, atelectasis, or pneumonia. According to the Fleischner Society, solitary pulmonary nodule may be classified according to size, morphology, and distribution (multiple or single). Causes of solitary pulmonary nodule may be classified into 5 categories: infectious, neoplastic, inflammatory, immunological, vascular, and miscellaneous. Common causes of solitary pulmonary nodule, include: tuberculosis, primary lung cancer, granulomas, and rheumatic disease. In the majority of the cases, solitary pulmonary nodule can be encountered as a [[incidentaloma|incidental finding]].<ref name="NEJM-cp">{{cite journal |author=Ost D, Fein AM, Feinsilver SH |title=Clinical practice. The solitary pulmonary nodule |journal=N. Engl. J. Med. |volume=348 |issue=25 |pages=2535–42 |year=2003 |month=June |pmid=12815140 |doi=10.1056/NEJMcp012290 |url=http://content.nejm.org/cgi/pmidlookup?view=short&pmid=12815140&promo=ONFLNS19}}</ref><ref name="pmid18402653">{{cite journal |author=Alzahouri K, Velten M, Arveux P, Woronoff-Lemsi MC, Jolly D, Guillemin F |title=Management of SPN in France. Pathways for definitive diagnosis of solitary pulmonary nodule: a multicentre study in 18 French districts |journal=BMC Cancer |volume=8 |issue= |pages=93 |year=2008 |pmid=18402653 |pmc=2373300 |doi=10.1186/1471-2407-8-93 |url=http://www.biomedcentral.com/1471-2407/8/93}}</ref> The nodule most commonly represents a [[benign]] tumor, such as a [[granuloma]] or [[hamartoma]], but in around 20% of cases it represents a [[malignant]] [[cancer]].<ref name="pmid18402653">{{cite journal |author=Alzahouri K, Velten M, Arveux P, Woronoff-Lemsi MC, Jolly D, Guillemin F |title=Management of SPN in France. Pathways for definitive diagnosis of solitary pulmonary nodule: a multicentre study in 18 French districts |journal=BMC Cancer |volume=8 |issue= |pages=93 |year=2008 |pmid=18402653 |pmc=2373300 |doi=10.1186/1471-2407-8-93 |url=http://www.biomedcentral.com/1471-2407/8/93}}</ref> Approximately 10 to 20% of patients with [[lung cancer]] are initially diagnosed with solitary pulmonary nodule.<ref name="pmid18402653"/> Conventional radiography is the initial method of choice for the diagnosis of solitary pulmonary nodule. The risk assessment of solitary pulmonary nodule will depend on several characteristics, such as: size, growth, shape, margin, air bronchogram sign, and attenuation. The solitary pulmonary nodule risk assessment is useful to determine the likelihood for malignancy and prompt treatment. Further evaluation of solitary pulmonary lung nodule, should include enhanced CT scan or MRI imaging. Other imaging studies include [[PET]] scanning, which may be useful as a staging modality, detection of occult disease, and malignancy assessment. The possibility of cancer needs to be ruled out through further radiological studies and interventions. The optimal management approach of solitary pulmonary nodule will mainly depend on the nodule size and growth. Other parameters, such as: location, and distribution may also be helpful for the therapeutical management of solitary pulmonary nodule. Surgical resection is often recommended among patients with the malignant likelihood of solitary pulmonary nodule. On the other hand, solitary pulmonary nodules with benign features are eligible for periodic CT surveillance. The [[prognosis]] of solitary pulmonary nodule depends on the underlying condition.
'''Pulmonary nodule''' '''(also known as " Solitary pulmonary nodule" or "SPN")''' is defined as a relatively well defined round or oval pulmonary [[Parenchyma|parenchymal]] [[lesion]] equal or smaller than 30 mm in [[diameter]]. Pulmonary nodule is usually surrounded by [[Lung|pulmonary]] [[parenchyma]] and/or [[visceral pleura]] and is not associated with [[lymphadenopathy]], [[atelectasis]], or [[pneumonia]]. Pulmonary nodule may be [[Classification|classified]] according to size (> 8 mm vs. ≤ 8 mm), [[attenuation]] (pure solid vs. part-solid), and distribution ([[solitary]] vs. multiple). It can also be [[Classification|classified]] into [[benign]] and [[malignant]] based on the [[radiological]] findings.Causes of pulmonary nodules can be [[Classification|classified]] into [[Etiology|etiologies]] presenting with [[solitary]] or multiple [[Lesion|lesions]]. Common causes of [[solitary]] pulmonary nodule include [[tuberculosis]], [[Lung cancer|primary lung cancer]], [[Granulomas|granuloma]], and [[rheumatic disease]]. Common causes of multiple pulmonary nodules include [[pulmonary]] [[neoplasms]] and [[tumor]] [[metastasis]] from other parts of the [[Human body|body]]. Pulmonary nodule may be differentiated according to [[imaging]] (size, border characteristics, and attenuation), [[Histology|histological]], and clinical features, from other diseases that demonstrate similar [[imaging]] findings. Common [[Differential diagnosis|differential diagnoses]] of pulmonary nodule include [[hamartoma]], [[granulomas]], [[Nodule|rheumatoid nodule]], and [[Metastasis|metastatic]] [[Lesion|lesions]]. Pulmonary nodules are common. The estimated [[prevalence]] of incidental pulmonary nodule ranges between 0.09% to 7% in the general population. The [[incidence rate]] of  pulmonary nodule increases with age, [[tobacco use]], and prior [[cancer]]; the [[median]] age at [[diagnosis]] is between 35 to 70 years. The [[prevalence]] of [[Cancer|malignancy]] among pulmonary nodules ranges between 0.2% to 50%. [[Male|Males]] are more commonly affected with pulmonary nodule than [[Female|females]]. The [[male]] to [[female]] ratio is approximately 2 to 1. There is no racial predilection to pulmonary nodule. According to the U.S. Preventive Services Task Force (USPSTF), [[Screening (medicine)|screening]] for suspected [[lung cancer]] by low-dose [[computed tomography]] is recommended every year among [[Smoking|smokers]] who are between 55 to 80 years old and who have [[smoking]] history of 30 [[Pack year|pack years]] or more and either continue to [[Smoking|smoke]] or have quit within the past 15 years (grade B recommendation). A [[hallmark]] feature in the evaluation of pulmonary nodule is the [[Cancer|malignancy]] risk assessment. The evaluation approach for pulmonary nodule will mainly depend in the initial [[Morphology|morphological]] evaluation of the [[Nodule (medicine)|nodule]] (size, margins, contours, and growth). Other characteristics, such as location, clinical features, and distribution may be helpful in the risk assessment, management, surveillance, and follow-up of pulmonary nodule. Pulmonary nodule can be divided into 3 risk categories: low risk, intermediate/moderate, and high risk. Based upon these risk categories, complementary [[Diagnosis|diagnostic]] studies and management include: [[Positron emission tomography|PET]]/[[Computed tomography|CT scan]], [[Computed tomography|CT scan]], non-surgical [[biopsy]], and [[Resection|surgical resection]]. [[Lung]] [[biopsy]] is the study of choice to [[Diagnosis|diagnose]] pulmonary nodule. [[Biopsy]] for pulmonary nodule may be [[Classification|classified]] into 2 categories: non-[[Surgery|surgical]] [[biopsy]] and [[Surgery|surgical]] [[biopsy]]. [[Biopsy]] findings associated with pulmonary nodule will depend on [[tumor]] [[histology]]. Common types of [[lung]] [[Tissue (biology)|tissue]] [[biopsy]] for solitary pulmonary nodule include conventional bronchoscopic-guided transbronchial [[biopsy]], [[Bronchoscopy|bronchoscopic]]-[[Bronchial|transbronchial]] [[Needle aspiration biopsy|needle aspiration]], endobronchial [[ultrasound]]-guided sheath [[Bronchial|transbronchial]] [[biopsy]], and endobronchial [[ultrasound]]-guided [[Bronchial|transbronchial]] [[Needle aspiration biopsy|needle aspiration]]. Common [[Indication (medicine)|indications]] for [[biopsy]] in pulmonary nodule include: high risk nodule (> 65%), intermediate risk nodule with a high risk [[patient]] profile, intermediate risk nodule with a positive [[Positron emission tomography|positron emission tomography scan]]. Pulmonary nodules are generally [[asymptomatic]]. In some cases, [[Patient|patients]] may develop non-specific [[Symptom|symptoms]], such as [[Dyspnea|difficulty breathing]], [[hemoptysis]], [[chronic cough]], [[Wheeze|wheezing]], and [[chest pain]]. Obtaining a detailed history is an important aspect of making a [[diagnosis]] of solitary pulmonary nodule. Specific areas of focus when obtaining history include previous [[infection]] of [[tuberculosis]], previous or current [[smoking]] history, history of [[Immunology|immunological]] conditions, high occupational risk profession, or recent traveling. [[Patient|Patients]] with pulmonary nodule usually are well-appearing. [[Physical examination]] of [[Patient|patients]] with pulmonary nodule usually has no remarkable findings. In some cases, solitary pulmonary nodule may show findings associated with the underlying condition. There are no [[Diagnosis|diagnostic]] [[Medical laboratory|laboratory]] findings associated with pulmonary nodule. There are no [[The electrocardiogram|ECG]] findings associated with pulmonary nodule. On conventional [[radiography]], characteristic findings of solitary pulmonary nodule include well-defined, small, and rounded opacities within the pulmonary [[interstitium]], usually 8 mm in [[diameter]] and normally surrounded by normal aerated [[lung]]. There are no [[echocardiography]]/[[ultrasound]] findings associated with pulmonary nodule. [[Computed tomography|CT scan]] is the method of choice for the [[diagnosis]] of solitary pulmonary nodule. On [[Computed tomography|CT]], characteristic findings of solitary pulmonary nodules include [[Ground glass opacification on CT|ground-glass opacity]], rounded mass, and less than 30 mm in size. The evaluation of solitary pulmonary nodule will depend on the following characteristics: [[calcification]] pattern, size, location, growth, shape, margins, [[attenuation]], and [[Contrast medium|contrast]] enhancement. On [[Magnetic resonance imaging|MRI]], characteristic features of pulmonary nodule include higher [[soft tissue]] [[Contrast medium|contrast]], lack of [[radiation exposure]], [[lesion]] characterization by evaluation of signal intensities, and characterization of the dynamics of [[contrast]] uptake. Other [[imaging]] studies include [[PET]]/[[Computed tomography|CT]] scanning, which may be useful as a [[Cancer staging|staging]] modality, detection of [[occult]] [[disease]], and [[Cancer|malignancy]] assessment. Other [[Diagnosis|diagnostic]] studies for solitary pulmonary nodule include transthoracic [[percutaneous]] [[fine needle aspiration]], [[bronchoscopy]], and [[mediastinoscopy]]. The optimal management approach of solitary pulmonary nodule mainly depends on the nodule size and growth. Other parameters, such as location and distribution may also be helpful. [[Surgical resection]] is often recommended among [[Patient|patients]] with a [[malignant]] likelihood of solitary pulmonary nodule. On the other hand, solitary pulmonary nodules with [[benign]] features are eligible for periodic [[Computed tomography|CT]] surveillance. [[Surgery|Surgical]] [[excision]] is the mainstay therapy for [[malignant]] or high risk pulmonary nodules. In pulmonary nodule, [[surgical procedure]] selection will depend on the size, margins, and size of the [[tumor]]. The preferred [[surgical procedure]] is wedge [[resection]] by video-assisted [[thoracic surgery]] and subsequent [[pathological]] evaluation. [[Prevention (medical)|Primary prevention]] of solitary pulmonary nodule includes avoidance of active and passive [[smoking]], exposure to [[asbestos]], and high risk occupational jobs. The [[American College of Chest Physicians|American College of Chest Physicians (ACCP)]] and Fleischner Society guidelines offer a strategy to manage and follow up on pulmonary nodule.


==Classification==
==Classification==


According to the Fleischner Society, solitary pulmonary nodules may be classified according to size, morphology, and distribution (multiple or single).
Pulmonary nodule may be [[Classification|classified]] according to size (> 8 mm vs. ≤ 8 mm), [[attenuation]] (pure solid vs. part-solid), and distribution ([[solitary]] vs. multiple). It can also be [[Classification|classified]] into [[benign]] and [[malignant]] based on the [[radiological]] findings.


==Causes==
==Causes==
Causes of solitary pulmonary nodule may be classified into 5 categories: infectious, neoplastic, inflammatory, immunological, vascular, and miscellaneous. Common causes of solitary pulmonary nodule, include: tuberculosis, primary lung cancer, granulomas, and rheumatic disease.
Causes of pulmonary nodules can be [[Classification|classified]] into [[Etiology|etiologies]] presenting with [[solitary]] or multiple [[Lesion|lesions]]. Common causes of [[solitary]] pulmonary nodule include [[tuberculosis]], [[Lung cancer|primary lung cancer]], [[Granulomas|granuloma]], and [[rheumatic disease]]. Common causes of multiple pulmonary nodules include [[pulmonary]] [[neoplasms]] and [[tumor]] [[metastasis]] from other parts of the [[Human body|body]].


==Differentiating Solitary Pulmonary Nodule from Other Diseases==
==Differentiating Solitary Pulmonary Nodule from Other Diseases==


Solitary pulmonary nodule may be differentiated according to imaging (size, border characteristics, and attenuation), histological, and clinical features, from other diseases that demonstrate similar imaging findings. Common differential diagnosis of solitary pulmonary nodule, include: [[hamartoma]], [[granulomas]], [[rheumatic nodule]], and [[single metastasis]]
Pulmonary nodule may be differentiated according to [[imaging]] (size, border characteristics, and attenuation), [[Histology|histological]], and clinical features, from other diseases that demonstrate similar [[imaging]] findings. Common [[Differential diagnosis|differential diagnoses]] of pulmonary nodule include [[hamartoma]], [[granulomas]], [[Nodule|rheumatoid nodule]], and [[Metastasis|metastatic]] [[Lesion|lesions]].


==Epidemiology and Demographics==
==Epidemiology and Demographics==


Solitary pulmonary nodules are common. The prevalence of solitary pulmonary nodule ranges between 8-51%. The incidence rate of solitary pulmonary nodule is approximately 45 per 100 000 individuals in the United States. The incidence of solitary pulmonary nodule increases with age, tobacco use, and prior cancer; the median age at diagnosis is between. Males are more commonly affected with lung masses than females. The male to female ratio is approximately 2 to 1.  
Pulmonary nodules are common. The estimated [[prevalence]] of incidental pulmonary nodule ranges between 0.09% to 7% in the general population. The [[incidence rate]] of pulmonary nodule increases with age, [[tobacco use]], and prior [[cancer]]; the [[median]] age at [[diagnosis]] is between 35 to 70 years. The [[prevalence]] of [[Cancer|malignancy]] among pulmonary nodules ranges between 0.2% to 50%. [[Male|Males]] are more commonly affected with pulmonary nodule than [[Female|females]]. The [[male]] to [[female]] ratio is approximately 2 to 1. There is no racial predilection to pulmonary nodule.


==Screening==
==Screening==


According to the the U.S. Preventive Service Task Force (USPSTF), there is insufficient evidence to recommend routine screening for solitary pulmonary nodule.<ref name="US">Recommendations. US preventive services task force(2016) http://www.uspreventiveservicestaskforce.org/BrowseRec/Search?s=solitary_pulmonary_nodule Accessed on March, 15th 2016</ref><ref name="NEJM">McWilliams A, Tammemagi MC, Mayo JR, et. al. Probability of cancer in pulmonary nodules detected on first screening CT. N Engl J Med. 2013 Sep 5;369(10):910-9. doi:10.1056/NEJMoa1214726.</ref>
According to the U.S. Preventive Services Task Force (USPSTF), [[Screening (medicine)|screening]] for suspected [[lung cancer]] by low-dose [[computed tomography]] is recommended every year among [[Smoking|smokers]] who are between 55 to 80 years old and who have [[smoking]] history of 30 [[Pack year|pack years]] or more and either continue to [[Smoking|smoke]] or have quit within the past 15 years (grade B recommendation).


==Diagnosis==
==Diagnosis==


===Evaluation of Solitary Pulmonary Nodule===
===Evaluation of Pulmonary Nodule===


A hallmark feature in the evaluation of solitary pulmonary nodule is the malignancy risk assessment. The evaluation approach of solitary pulmonary nodule will mainly depend in the initial morphological evaluation of the nodule (size, margins, contours, and growth). Other characteristics, such as: location, clinical features, and distribution may be helpful for the risk assessment, therapeutical management, surveillance, and follow-up of solitary pulmonary nodule. Solitary pulmonary nodule can be divided into 4 risk categories: low risk, intermediate, moderate and high risk. Based upon these risk categories, complementary diagnostic studies and management, include: PET/CT scan, CT scan, non-surgical biopsy, and surgical resection.
A [[hallmark]] feature in the evaluation of pulmonary nodule is the [[Cancer|malignancy]] risk assessment. The evaluation approach for pulmonary nodule will mainly depend in the initial [[Morphology|morphological]] evaluation of the [[Nodule (medicine)|nodule]] (size, margins, contours, and growth). Other characteristics, such as location, clinical features, and distribution may be helpful in the risk assessment, management, surveillance, and follow-up of pulmonary nodule. Pulmonary nodule can be divided into 3 risk categories: low risk, intermediate/moderate, and high risk. Based upon these risk categories, complementary [[Diagnosis|diagnostic]] studies and management include: [[Positron emission tomography|PET]]/[[Computed tomography|CT scan]], [[Computed tomography|CT scan]], non-surgical [[biopsy]], and [[Resection|surgical resection]].
 
===Diagnostic Study of Choice===
[[Lung]] [[biopsy]] is the study of choice to [[Diagnosis|diagnose]] pulmonary nodule. [[Biopsy]] for pulmonary nodule may be [[Classification|classified]] into 2 categories: non-[[Surgery|surgical]] [[biopsy]] and [[Surgery|surgical]] [[biopsy]]. [[Biopsy]] findings associated with pulmonary nodule will depend on [[tumor]] [[histology]]. Common types of [[lung]] [[Tissue (biology)|tissue]] [[biopsy]] for solitary pulmonary nodule include conventional bronchoscopic-guided transbronchial [[biopsy]], [[Bronchoscopy|bronchoscopic]]-[[Bronchial|transbronchial]] [[Needle aspiration biopsy|needle aspiration]], endobronchial [[ultrasound]]-guided sheath [[Bronchial|transbronchial]] [[biopsy]], and endobronchial [[ultrasound]]-guided [[Bronchial|transbronchial]] [[Needle aspiration biopsy|needle aspiration]]. Common [[Indication (medicine)|indications]] for [[biopsy]] in pulmonary nodule include: high risk nodule (> 65%), intermediate risk nodule with a high risk [[patient]] profile, intermediate risk nodule with a positive [[Positron emission tomography|positron emission tomography scan]].


===History and Symptoms===
===History and Symptoms===


Solitary pulmonary nodules are generally [[asymptomatic]]. In some cases, patients may develop non-specific symptoms, such as: dyspnea, hemoptysis, chronic coughing, wheezing, and chest pain. Obtaining the detailed history can be an important aspect of making a diagnosis of solitary pulmonary nodule, specific areas of focus when obtaining the history, include: previous infection of tuberculosis, previous or current smoking history, history of immunological conditions, high occupational risk profession, or recent traveling.<ref name="pmid26579486">{{cite journal |vauthors=Hakim DN, Pelly T, Kulendran M, Caris JA |title=Benign tumours of the bone: A review |journal=J Bone Oncol |volume=4 |issue=2 |pages=37–41 |year=2015 |pmid=26579486 |pmc=4620948 |doi=10.1016/j.jbo.2015.02.001 |url=}}</ref>
Pulmonary nodules are generally [[asymptomatic]]. In some cases, [[Patient|patients]] may develop non-specific [[Symptom|symptoms]], such as [[Dyspnea|difficulty breathing]], [[hemoptysis]], [[chronic cough]], [[Wheeze|wheezing]], and [[chest pain]]. Obtaining a detailed history is an important aspect of making a [[diagnosis]] of solitary pulmonary nodule. Specific areas of focus when obtaining history include previous [[infection]] of [[tuberculosis]], previous or current [[smoking]] history, history of [[Immunology|immunological]] conditions, high occupational risk profession, or recent traveling.


===Physical Examination===
===Physical Examination===
Patients with solitary pulmonary nodule usually are well-appearing. Physical examination of patients with solitary pulmonary nodule usually has no remarkable findings. In some cases, solitary pulmonary nodule may show some findings associated with the underlying condition.
[[Patient|Patients]] with pulmonary nodule usually are well-appearing. [[Physical examination]] of [[Patient|patients]] with pulmonary nodule usually has no remarkable findings. In some cases, solitary pulmonary nodule may show findings associated with the underlying condition.


===Laboratory Findings===
===Laboratory Findings===
There are no diagnostic laboratory findings associated with solitary pulmonary nodule.  
There are no [[Diagnosis|diagnostic]] [[Medical laboratory|laboratory]] findings associated with pulmonary nodule.
 
===Electrocardiogram===
There are no [[The electrocardiogram|ECG]] findings associated with pulmonary nodule.
 
===X-ray===
On conventional [[radiography]], characteristic findings of solitary pulmonary nodule include well-defined, small, and rounded opacities within the pulmonary [[interstitium]], usually 8 mm in [[diameter]] and normally surrounded by normal aerated [[lung]].


===Imaging===
===Echocardiography and Ultrasound===
There are no [[echocardiography]]/[[ultrasound]] findings associated with pulmonary nodule.


Conventional radiography is the initial method of choice for the diagnosis of solitary pulmonary nodule. The evaluation and risk assessment of solitary pulmonary nodule will depend on several characteristics, such as: size, growth, shape, margin, air bronchogram sign, and attenuation. Further evaluation of solitary pulmonary lung nodule, should include enhanced CT scan or MRI imaging. Other imaging studies include [[PET]] scanning, which may be useful as a staging modality, detection of occult disease, and malignancy assessment.
===CT scan===
[[Computed tomography|CT scan]] is the method of choice for the [[diagnosis]] of solitary pulmonary nodule. On [[Computed tomography|CT]], characteristic findings of solitary pulmonary nodules include [[Ground glass opacification on CT|ground-glass opacity]], rounded mass, and less than 30 mm in size. The evaluation of solitary pulmonary nodule will depend on the following characteristics: [[calcification]] pattern, size, location, growth, shape, margins, [[attenuation]], and [[Contrast medium|contrast]] enhancement.
 
===MRI===
On [[Magnetic resonance imaging|MRI]], characteristic features of pulmonary nodule include higher [[soft tissue]] [[Contrast medium|contrast]], lack of [[radiation exposure]], [[lesion]] characterization by evaluation of signal intensities, and characterization of the dynamics of [[contrast]] uptake.
 
===Other Imaging Findings===
Other [[imaging]] studies include [[PET]]/[[Computed tomography|CT]] scanning, which may be useful as a [[Cancer staging|staging]] modality, detection of [[occult]] [[disease]], and [[Cancer|malignancy]] assessment.


===Other Diagnostic Studies===
===Other Diagnostic Studies===
Other [[Diagnosis|diagnostic]] studies for solitary pulmonary nodule include transthoracic [[percutaneous]] [[fine needle aspiration]], [[bronchoscopy]], and [[mediastinoscopy]].


Other diagnostic studies for solitary pulmonary nodule, include: transthoracic percutaneous [[fine needle aspiration]], [[bronchoscopy]], and [[mediastinoscopy]].<ref name="pmid24484269">{{cite journal |vauthors=Kinsey CM, Arenberg DA |title=Endobronchial ultrasound-guided transbronchial needle aspiration for non-small cell lung cancer staging |journal=Am. J. Respir. Crit. Care Med. |volume=189 |issue=6 |pages=640–9 |year=2014 |pmid=24484269 |doi=10.1164/rccm.201311-2007CI |url=}}</ref>
== Treatment ==


==Treatment==
===Medical Therapy===
The optimal management approach of solitary pulmonary nodule mainly depends on the nodule size and growth. Other parameters, such as location and distribution may also be helpful. [[Surgical resection]] is often recommended among [[Patient|patients]] with a [[malignant]] likelihood of solitary pulmonary nodule. On the other hand, solitary pulmonary nodules with [[benign]] features are eligible for periodic [[Computed tomography|CT]] surveillance.


===Therapeutic Management===
===Surgery===
[[Surgery|Surgical]] [[excision]] is the mainstay therapy for [[malignant]] or high risk pulmonary nodules. In pulmonary nodule, [[surgical procedure]] selection will depend on the size, margins, and size of the [[tumor]]. The preferred [[surgical procedure]] is wedge [[resection]] by video-assisted [[thoracic surgery]] and subsequent [[pathological]] evaluation.


The optimal management approach of solitary pulmonary nodule will mainly depend on the nodule size and growth. Other parameters, such as: location, and distribution may also be helpful for the therapeutical management of solitary pulmonary nodule. Moreover, the solitary pulmonary nodule risk assessment is useful to determine the likelihood for malignancy and treatment.  Surgical resection is often recommended among patients with the malignant likelihood of solitary pulmonary nodule. On the other hand, solitary pulmonary nodules with benign features are eligible for periodic CT surveillance.
===Primary Prevention===
[[Prevention (medical)|Primary prevention]] of solitary pulmonary nodule includes avoidance of active and passive [[smoking]], exposure to [[asbestos]], and high risk occupational jobs.
 
===Secondary Prevention===
The [[American College of Chest Physicians|American College of Chest Physicians (ACCP)]] and Fleischner Society guidelines offer a strategy to manage and follow up on pulmonary nodule.


==References==
==References==
{{Reflist|2}}
{{Reflist|2}}


[[Category:Pulmonology]]
[[Category:Pulmonology]]

Latest revision as of 13:42, 2 July 2019

Pulmonary Nodule Microchapters

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Diagnostic Study of Choice

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Physical Examination

Laboratory Findings

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Associate Editor(s)-in-Chief: Maria Fernanda Villarreal, M.D. [2]

Overview

Pulmonary nodule (also known as " Solitary pulmonary nodule" or "SPN") is defined as a relatively well defined round or oval pulmonary parenchymal lesion equal or smaller than 30 mm in diameter. Pulmonary nodule is usually surrounded by pulmonary parenchyma and/or visceral pleura and is not associated with lymphadenopathy, atelectasis, or pneumonia. Pulmonary nodule may be classified according to size (> 8 mm vs. ≤ 8 mm), attenuation (pure solid vs. part-solid), and distribution (solitary vs. multiple). It can also be classified into benign and malignant based on the radiological findings.Causes of pulmonary nodules can be classified into etiologies presenting with solitary or multiple lesions. Common causes of solitary pulmonary nodule include tuberculosis, primary lung cancer, granuloma, and rheumatic disease. Common causes of multiple pulmonary nodules include pulmonary neoplasms and tumor metastasis from other parts of the body. Pulmonary nodule may be differentiated according to imaging (size, border characteristics, and attenuation), histological, and clinical features, from other diseases that demonstrate similar imaging findings. Common differential diagnoses of pulmonary nodule include hamartoma, granulomas, rheumatoid nodule, and metastatic lesions. Pulmonary nodules are common. The estimated prevalence of incidental pulmonary nodule ranges between 0.09% to 7% in the general population. The incidence rate of pulmonary nodule increases with age, tobacco use, and prior cancer; the median age at diagnosis is between 35 to 70 years. The prevalence of malignancy among pulmonary nodules ranges between 0.2% to 50%. Males are more commonly affected with pulmonary nodule than females. The male to female ratio is approximately 2 to 1. There is no racial predilection to pulmonary nodule. According to the U.S. Preventive Services Task Force (USPSTF), screening for suspected lung cancer by low-dose computed tomography is recommended every year among smokers who are between 55 to 80 years old and who have smoking history of 30 pack years or more and either continue to smoke or have quit within the past 15 years (grade B recommendation). A hallmark feature in the evaluation of pulmonary nodule is the malignancy risk assessment. The evaluation approach for pulmonary nodule will mainly depend in the initial morphological evaluation of the nodule (size, margins, contours, and growth). Other characteristics, such as location, clinical features, and distribution may be helpful in the risk assessment, management, surveillance, and follow-up of pulmonary nodule. Pulmonary nodule can be divided into 3 risk categories: low risk, intermediate/moderate, and high risk. Based upon these risk categories, complementary diagnostic studies and management include: PET/CT scan, CT scan, non-surgical biopsy, and surgical resection. Lung biopsy is the study of choice to diagnose pulmonary nodule. Biopsy for pulmonary nodule may be classified into 2 categories: non-surgical biopsy and surgical biopsy. Biopsy findings associated with pulmonary nodule will depend on tumor histology. Common types of lung tissue biopsy for solitary pulmonary nodule include conventional bronchoscopic-guided transbronchial biopsy, bronchoscopic-transbronchial needle aspiration, endobronchial ultrasound-guided sheath transbronchial biopsy, and endobronchial ultrasound-guided transbronchial needle aspiration. Common indications for biopsy in pulmonary nodule include: high risk nodule (> 65%), intermediate risk nodule with a high risk patient profile, intermediate risk nodule with a positive positron emission tomography scan. Pulmonary nodules are generally asymptomatic. In some cases, patients may develop non-specific symptoms, such as difficulty breathing, hemoptysis, chronic cough, wheezing, and chest pain. Obtaining a detailed history is an important aspect of making a diagnosis of solitary pulmonary nodule. Specific areas of focus when obtaining history include previous infection of tuberculosis, previous or current smoking history, history of immunological conditions, high occupational risk profession, or recent traveling. Patients with pulmonary nodule usually are well-appearing. Physical examination of patients with pulmonary nodule usually has no remarkable findings. In some cases, solitary pulmonary nodule may show findings associated with the underlying condition. There are no diagnostic laboratory findings associated with pulmonary nodule. There are no ECG findings associated with pulmonary nodule. On conventional radiography, characteristic findings of solitary pulmonary nodule include well-defined, small, and rounded opacities within the pulmonary interstitium, usually 8 mm in diameter and normally surrounded by normal aerated lung. There are no echocardiography/ultrasound findings associated with pulmonary nodule. CT scan is the method of choice for the diagnosis of solitary pulmonary nodule. On CT, characteristic findings of solitary pulmonary nodules include ground-glass opacity, rounded mass, and less than 30 mm in size. The evaluation of solitary pulmonary nodule will depend on the following characteristics: calcification pattern, size, location, growth, shape, margins, attenuation, and contrast enhancement. On MRI, characteristic features of pulmonary nodule include higher soft tissue contrast, lack of radiation exposure, lesion characterization by evaluation of signal intensities, and characterization of the dynamics of contrast uptake. Other imaging studies include PET/CT scanning, which may be useful as a staging modality, detection of occult disease, and malignancy assessment. Other diagnostic studies for solitary pulmonary nodule include transthoracic percutaneous fine needle aspiration, bronchoscopy, and mediastinoscopy. The optimal management approach of solitary pulmonary nodule mainly depends on the nodule size and growth. Other parameters, such as location and distribution may also be helpful. Surgical resection is often recommended among patients with a malignant likelihood of solitary pulmonary nodule. On the other hand, solitary pulmonary nodules with benign features are eligible for periodic CT surveillance. Surgical excision is the mainstay therapy for malignant or high risk pulmonary nodules. In pulmonary nodule, surgical procedure selection will depend on the size, margins, and size of the tumor. The preferred surgical procedure is wedge resection by video-assisted thoracic surgery and subsequent pathological evaluation. Primary prevention of solitary pulmonary nodule includes avoidance of active and passive smoking, exposure to asbestos, and high risk occupational jobs. The American College of Chest Physicians (ACCP) and Fleischner Society guidelines offer a strategy to manage and follow up on pulmonary nodule.

Classification

Pulmonary nodule may be classified according to size (> 8 mm vs. ≤ 8 mm), attenuation (pure solid vs. part-solid), and distribution (solitary vs. multiple). It can also be classified into benign and malignant based on the radiological findings.

Causes

Causes of pulmonary nodules can be classified into etiologies presenting with solitary or multiple lesions. Common causes of solitary pulmonary nodule include tuberculosis, primary lung cancer, granuloma, and rheumatic disease. Common causes of multiple pulmonary nodules include pulmonary neoplasms and tumor metastasis from other parts of the body.

Differentiating Solitary Pulmonary Nodule from Other Diseases

Pulmonary nodule may be differentiated according to imaging (size, border characteristics, and attenuation), histological, and clinical features, from other diseases that demonstrate similar imaging findings. Common differential diagnoses of pulmonary nodule include hamartoma, granulomas, rheumatoid nodule, and metastatic lesions.

Epidemiology and Demographics

Pulmonary nodules are common. The estimated prevalence of incidental pulmonary nodule ranges between 0.09% to 7% in the general population. The incidence rate of pulmonary nodule increases with age, tobacco use, and prior cancer; the median age at diagnosis is between 35 to 70 years. The prevalence of malignancy among pulmonary nodules ranges between 0.2% to 50%. Males are more commonly affected with pulmonary nodule than females. The male to female ratio is approximately 2 to 1. There is no racial predilection to pulmonary nodule.

Screening

According to the U.S. Preventive Services Task Force (USPSTF), screening for suspected lung cancer by low-dose computed tomography is recommended every year among smokers who are between 55 to 80 years old and who have smoking history of 30 pack years or more and either continue to smoke or have quit within the past 15 years (grade B recommendation).

Diagnosis

Evaluation of Pulmonary Nodule

A hallmark feature in the evaluation of pulmonary nodule is the malignancy risk assessment. The evaluation approach for pulmonary nodule will mainly depend in the initial morphological evaluation of the nodule (size, margins, contours, and growth). Other characteristics, such as location, clinical features, and distribution may be helpful in the risk assessment, management, surveillance, and follow-up of pulmonary nodule. Pulmonary nodule can be divided into 3 risk categories: low risk, intermediate/moderate, and high risk. Based upon these risk categories, complementary diagnostic studies and management include: PET/CT scan, CT scan, non-surgical biopsy, and surgical resection.

Diagnostic Study of Choice

Lung biopsy is the study of choice to diagnose pulmonary nodule. Biopsy for pulmonary nodule may be classified into 2 categories: non-surgical biopsy and surgical biopsy. Biopsy findings associated with pulmonary nodule will depend on tumor histology. Common types of lung tissue biopsy for solitary pulmonary nodule include conventional bronchoscopic-guided transbronchial biopsy, bronchoscopic-transbronchial needle aspiration, endobronchial ultrasound-guided sheath transbronchial biopsy, and endobronchial ultrasound-guided transbronchial needle aspiration. Common indications for biopsy in pulmonary nodule include: high risk nodule (> 65%), intermediate risk nodule with a high risk patient profile, intermediate risk nodule with a positive positron emission tomography scan.

History and Symptoms

Pulmonary nodules are generally asymptomatic. In some cases, patients may develop non-specific symptoms, such as difficulty breathing, hemoptysis, chronic cough, wheezing, and chest pain. Obtaining a detailed history is an important aspect of making a diagnosis of solitary pulmonary nodule. Specific areas of focus when obtaining history include previous infection of tuberculosis, previous or current smoking history, history of immunological conditions, high occupational risk profession, or recent traveling.

Physical Examination

Patients with pulmonary nodule usually are well-appearing. Physical examination of patients with pulmonary nodule usually has no remarkable findings. In some cases, solitary pulmonary nodule may show findings associated with the underlying condition.

Laboratory Findings

There are no diagnostic laboratory findings associated with pulmonary nodule.

Electrocardiogram

There are no ECG findings associated with pulmonary nodule.

X-ray

On conventional radiography, characteristic findings of solitary pulmonary nodule include well-defined, small, and rounded opacities within the pulmonary interstitium, usually 8 mm in diameter and normally surrounded by normal aerated lung.

Echocardiography and Ultrasound

There are no echocardiography/ultrasound findings associated with pulmonary nodule.

CT scan

CT scan is the method of choice for the diagnosis of solitary pulmonary nodule. On CT, characteristic findings of solitary pulmonary nodules include ground-glass opacity, rounded mass, and less than 30 mm in size. The evaluation of solitary pulmonary nodule will depend on the following characteristics: calcification pattern, size, location, growth, shape, margins, attenuation, and contrast enhancement.

MRI

On MRI, characteristic features of pulmonary nodule include higher soft tissue contrast, lack of radiation exposure, lesion characterization by evaluation of signal intensities, and characterization of the dynamics of contrast uptake.

Other Imaging Findings

Other imaging studies include PET/CT scanning, which may be useful as a staging modality, detection of occult disease, and malignancy assessment.

Other Diagnostic Studies

Other diagnostic studies for solitary pulmonary nodule include transthoracic percutaneous fine needle aspiration, bronchoscopy, and mediastinoscopy.

Treatment

Medical Therapy

The optimal management approach of solitary pulmonary nodule mainly depends on the nodule size and growth. Other parameters, such as location and distribution may also be helpful. Surgical resection is often recommended among patients with a malignant likelihood of solitary pulmonary nodule. On the other hand, solitary pulmonary nodules with benign features are eligible for periodic CT surveillance.

Surgery

Surgical excision is the mainstay therapy for malignant or high risk pulmonary nodules. In pulmonary nodule, surgical procedure selection will depend on the size, margins, and size of the tumor. The preferred surgical procedure is wedge resection by video-assisted thoracic surgery and subsequent pathological evaluation.

Primary Prevention

Primary prevention of solitary pulmonary nodule includes avoidance of active and passive smoking, exposure to asbestos, and high risk occupational jobs.

Secondary Prevention

The American College of Chest Physicians (ACCP) and Fleischner Society guidelines offer a strategy to manage and follow up on pulmonary nodule.

References


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