Lung cancer Diagnostic study of choice: Difference between revisions

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{{Lung cancer}}
{{Lung cancer}}
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== Overview ==
==Overview==
Chest CT scan is the modality of choice in the diagnosis of lung cancer. Findings on CT scan suggestive of lung cancer include, a solitary [[pulmonary nodule]], centrally located [[Tumor|masses]], [[Mediastinum|mediastinal]] invasion
CT scans help stage the lung cancer. A CT scan of the abdomen and brain can help visualize the common sights of metastases: adrenal glands, liver, and brain. CT scans diagnose lung cancer by providing anatomical detail to locate the [[tumor]], demonstrating proximity to nearby structures, and deciphering whether [[lymph nodes]] are enlarged in the [[mediastinum]].


== Diagnostic Study of Choice ==
== CT Scan ==
Chest CT scan is the modality of choice in the diagnosis of lung cancer. Findings on CT scan suggestive of lung cancer include:<ref name="PurandareRangarajan2015">{{cite journal|last1=Purandare|first1=NilenduC|last2=Rangarajan|first2=Venkatesh|title=Imaging of lung cancer: Implications on staging and management|journal=Indian Journal of Radiology and Imaging|volume=25|issue=2|year=2015|pages=109|issn=0971-3026|doi=10.4103/0971-3026.155831}}</ref>
*Solitary [[pulmonary nodule]]
*Centrally located [[Tumor|masses]]
*[[Mediastinum|Mediastinal]] invasion
*Peripherally situated [[Lesion|lesions]] invading the [[Thoracic cavity|chest wall]]
*A [[Ground glass opacification on CT|ground-glass opacity]]
*[[Consolidation (medicine)|Consolidation]]
*Mixed density or pure ground glass [[Nodule (medicine)|nodules]]
*Mixed density or pure ground glass [[Consolidation (medicine)|consolidation]]


===== Template statements =====
{| class="wikitable"
 
|[[Image:IJRI-25-109-g001.jpg|thumb|300px|Common radiological appearances of lung cancer. Centrally located mass with mediastinal invasion (arrow, A), peripherally situated mass abutting the pleura (arrow, B), mass with smooth, lobulated margins (arrow, C) and with spiculated, irregular margins (arrow, D), via <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4419420/figure/F1/><ref name="PurandareRangarajan2015">{{cite journal|last1=Purandare|first1=NilenduC|last2=Rangarajan|first2=Venkatesh|title=Imaging of lung cancer: Implications on staging and management|journal=Indian Journal of Radiology and Imaging|volume=25|issue=2|year=2015|pages=109|issn=0971-3026|doi=10.4103/0971-3026.155831}}</ref>]]
=== Study of choice: ===
|[[Image:IJRI-25-109-g002.jpg|thumb|300px|Lung cancers with atypical radiological pattern. Squamous cell cancer presenting as a cavitating mass (arrow, A). Adenocarcinoma presenting as dense consolidation (arrow, B). Bronchoalveolar carcinoma (adenocarcinoma in situ) presenting as ground-glass opacity (arrow, C) and mixed density, solid (arrow), and ground-glass nodules (arrowhead) in D via <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4419420/figure/F2/><ref name="PurandareRangarajan2015">{{cite journal|last1=Purandare|first1=NilenduC|last2=Rangarajan|first2=Venkatesh|title=Imaging of lung cancer: Implications on staging and management|journal=Indian Journal of Radiology and Imaging|volume=25|issue=2|year=2015|pages=109|issn=0971-3026|doi=10.4103/0971-3026.155831}}</ref>]]
* [Name of the investigation] is the gold standard test for the diagnosis of [disease name].
* The following result of [gold standard test] is confirmatory of [disease name]:
** Result 1
** Result 2
* The [name of the investigation] should be performed when:
** The patient presented with symptoms/signs 1. 2, 3.
** A positive [test] is detected in the patient.
* [Name of the investigation] is the gold standard test for the diagnosis of [disease name].
* The diagnostic study of choice for [disease name] is [name of the investigation].
* There is no single diagnostic study of choice for the diagnosis of [disease name].
* There is no single diagnostic study of choice for the diagnosis of [disease name], but [disease name] can be diagnosed based on [name of the investigation 1] and [name of the investigation 2].
* [Disease name] is mainly diagnosed based on clinical presentation.
* Investigations:
** Among patients who present with clinical signs of [disease name], the [investigation name] is the most specific test for the diagnosis.
** Among patients who present with clinical signs of [disease name], the [investigation name] is the most sensitive test for diagnosis.
** Among patients who present with clinical signs of [disease name], the [investigation name] is the most efficient test for diagnosis.
 
==== The comparison table for diagnostic studies of choice for [disease name] ====
{|
|- style="background: #4479BA; color: #FFFFFF; text-align: center;"
! style="background: #FFFFFF; color: #FFFFFF; text-align: center;" |
! style="background: #4479BA; color: #FFFFFF; text-align: center;" |Sensitivity
! style="background: #4479BA; color: #FFFFFF; text-align: center;" |Specificity
|-
|-
! style="background: #696969; color: #FFFFFF; text-align: center;" |Test 1
|[[Image:IJRI-25-109-g003.jpg|thumb|300px|Stage T1 and T2 tumors. Stage T1 tumor due to size <3 cm (arrow, A). Stage T2 endobronchial tumor (arrowhead) causing pneumonitis restricted to the upper lobe (arrow) in B. T2a tumor >3 cm but <5 cm (arrow, C). T2b tumor >5 cm but <7 cm (arrow in D) via <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4419420/figure/F3/><ref name="PurandareRangarajan2015">{{cite journal|last1=Purandare|first1=NilenduC|last2=Rangarajan|first2=Venkatesh|title=Imaging of lung cancer: Implications on staging and management|journal=Indian Journal of Radiology and Imaging|volume=25|issue=2|year=2015|pages=109|issn=0971-3026|doi=10.4103/0971-3026.155831}}</ref>]]
| style="background: #DCDCDC; padding: 5px; text-align: center;" |✔
|[[Image:IJRI-25-109-g004.jpg|thumb|300px|Stage T3 tumors. T3 tumor due to size >7 cm in size (arrow, A), eroding the ribs (arrow, B), infiltrating the mediastinal pleura but not the vessels (arrow, C), and causing atelectasis of the entire lung (arrowhead, D via<https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4419420/figure/F4/>.<ref name="PurandareRangarajan2015">{{cite journal|last1=Purandare|first1=NilenduC|last2=Rangarajan|first2=Venkatesh|title=Imaging of lung cancer: Implications on staging and management|journal=Indian Journal of Radiology and Imaging|volume=25|issue=2|year=2015|pages=109|issn=0971-3026|doi=10.4103/0971-3026.155831}}</ref>]]
| style="background: #DCDCDC; padding: 5px; text-align: center;" |...%
|-
|-
! style="background: #696969; color: #FFFFFF; text-align: center;" |Test 2
|[[Image:IJRI-25-109-g004.jpg|thumb|300px|Stage T4 tumors. T4 tumor due to invasion of pulmonary artery (arrow, A), descending aorta (arrow, B), vertebral body (arrow, C), superior vena cava with thrombus (arrow, D)via<https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4419420/figure/F5/><ref name="PurandareRangarajan2015">{{cite journal|last1=Purandare|first1=NilenduC|last2=Rangarajan|first2=Venkatesh|title=Imaging of lung cancer: Implications on staging and management|journal=Indian Journal of Radiology and Imaging|volume=25|issue=2|year=2015|pages=109|issn=0971-3026|doi=10.4103/0971-3026.155831}}</ref>]]
| style="background: #DCDCDC; padding: 5px; text-align: center;" |...%
|[[Image:IJRI-25-109-g016.jpg|thumb|300px|
| style="background: #DCDCDC; padding: 5px; text-align: center;" |✔
 
Superior sulcus tumor. Axial (A) and coronal (B) CT scans show a large mass in the apex of the right lung causing destruction of the first and second ribs (arrows) with erosion of the right half of the vertebral body (arrowheads) suggestive of a superior sulcus tumor, via<https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4419420/figure/F16/><ref name="PurandareRangarajan2015">{{cite journal|last1=Purandare|first1=NilenduC|last2=Rangarajan|first2=Venkatesh|title=Imaging of lung cancer: Implications on staging and management|journal=Indian Journal of Radiology and Imaging|volume=25|issue=2|year=2015|pages=109|issn=0971-3026|doi=10.4103/0971-3026.155831}}</ref>]]
|}
|}
<small> ✔= The best test based on the feature </small>


===== Diagnostic results =====
== Spiral CT perfusion imaging ==
The following result of [investigation name] is confirmatory of [disease name]:
*Spiral CT perfusion study can be used as a diagnostic method for peripheral pulmonary nodules.
* Result 1
*Spiral CT perfusion study provides non-invasive method of quantitative assessment about the blood flow patterns of peripheral pulmonary nodules. 
* Result 2
*Spiral CT perfusion imaging is analyzed and evaluated for:.<ref name="MaLe2008">{{cite journal|last1=Ma|first1=Shu-Hua|last2=Le|first2=Hong-Bo|last3=Jia|first3=Bao-hui|last4=Wang|first4=Zhao-Xin|last5=Xiao|first5=Zhuang-Wei|last6=Cheng|first6=Xiao-Ling|last7=Mei|first7=Wei|last8=Wu|first8=Min|last9=Hu|first9=Zhi-Guo|last10=Li|first10=Yu-Guang|title=Peripheral pulmonary nodules: Relationship between multi-slice spiral CT perfusion imaging and tumor angiogenesis and VEGF expression|journal=BMC Cancer|volume=8|issue=1|year=2008|issn=1471-2407|doi=10.1186/1471-2407-8-186}}</ref>]]
**TDC (time density curve)
**Perfusion parametric maps
**The respective perfusion parameters.
**Immunohistochemical findings of microvessel density (MVD) measurement
**VEGF expression
{| class="wikitable"
|[[Image:Peripheral pulmonary nodules1.jpg|thumb|300px|(A-H) Poorly differentiated adenocarcinoma found in the apicoposterior segment of superior lobe of the left lung of a 56 year-old male. (A) Time density curve. (B-F) (original image, BF, BV, MTT, PS) typeI parametric maps, PS value is higher (30.883). (G) CD34 staining shows many immature tumor microvessels (× 200). (H) VEGF expression is strong positive (× 400) via, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2474637/figure/F6/.<ref name="MaLe2008">{{cite journal|last1=Ma|first1=Shu-Hua|last2=Le|first2=Hong-Bo|last3=Jia|first3=Bao-hui|last4=Wang|first4=Zhao-Xin|last5=Xiao|first5=Zhuang-Wei|last6=Cheng|first6=Xiao-Ling|last7=Mei|first7=Wei|last8=Wu|first8=Min|last9=Hu|first9=Zhi-Guo|last10=Li|first10=Yu-Guang|title=Peripheral pulmonary nodules: Relationship between multi-slice spiral CT perfusion imaging and tumor angiogenesis and VEGF expression|journal=BMC Cancer|volume=8|issue=1|year=2008|issn=1471-2407|doi=10.1186/1471-2407-8-186}}</ref>]]
||[[Image:Squamous_cell_Ca.jpg|thumb|300px|(A-H) (A-H) Well differentiated squamous cell carcinoma found in the posterior basal segment of inferior lobe of the right lung of a 61-year-old male. (A) Time density curve. (B-F) (original image, BF, BV, MTT, PS) TypeII parametric maps, PS value is higher (27.051). (G) CD34 staining shows many immature tumor microvessels (× 200). (H) VEGF expression is strong positive (× 400). via, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2474637/figure/F3/.<ref name="MaLe2008">{{cite journal|last1=Ma|first1=Shu-Hua|last2=Le|first2=Hong-Bo|last3=Jia|first3=Bao-hui|last4=Wang|first4=Zhao-Xin|last5=Xiao|first5=Zhuang-Wei|last6=Cheng|first6=Xiao-Ling|last7=Mei|first7=Wei|last8=Wu|first8=Min|last9=Hu|first9=Zhi-Guo|last10=Li|first10=Yu-Guang|title=Peripheral pulmonary nodules: Relationship between multi-slice spiral CT perfusion imaging and tumor angiogenesis and VEGF expression|journal=BMC Cancer|volume=8|issue=1|year=2008|issn=1471-2407|doi=10.1186/1471-2407-8-186}}</ref>]]
|}


===== Sequence of Diagnostic Studies =====
== CT Findings of Metastatic disease ==
The [name of investigation] should be performed when:
*CT scans help stage the lung cancer. A CT scan of the abdomen and brain can help visualize the common sights of metastases: adrenal glands, liver, and brain.
* The patient presented with symptoms/signs 1, 2, and 3 as the first step of diagnosis.
*The benefits of CT Scans in lung cancer patients are the following:<ref name="Silvestri">Gerard A. Silvestri, Lynn T. Tanoue, Mitchell L. Margolis, John Barker, Frank Detterbeck.11/30/11.The Noninvasive Staging of Non Small-cell Lung Cancer. Chestpubs. http://chestjournal.chestpubs.org/content/123/1_suppl/147S.full/</ref>
* A positive [test] is detected in the patient, to confirm the diagnosis.
**Provides anatomical detail to locate the [[tumor]]
**Demonstrates proximity to nearby structures
**Deciphers whether [[lymph nodes]] are enlarged in the [[mediastinum]]
{| class="wikitable"
|[[Image:IJRI-25-109-g010.jpg|thumb|300px|Metastatic disease. Bilateral pleural effusions-M1a (arrow, A), lung metastases-M1a (arrows, B), adrenal metastasis-M1b (arrow, C), vertebral metastasis-M1b (arrow, D), brain metastasis-M1b (arrow, E), liver metastases-M1b (arrows, F)via<https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4419420/figure/F10/>This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.<ref name="PurandareRangarajan2015">{{cite journal|last1=Purandare|first1=NilenduC|last2=Rangarajan|first2=Venkatesh|title=Imaging of lung cancer: Implications on staging and management|journal=Indian Journal of Radiology and Imaging|volume=25|issue=2|year=2015|pages=109|issn=0971-3026|doi=10.4103/0971-3026.155831}}</ref>]]
|[[Image:IJRI-25-109-g011.jpg|thumb|300px|Adrenal adenoma versus metastasis. Enhancing solid adrenal nodule on CT scan in a case of lung cancer (arrow, A) suggestive of metastatic deposit. Unenhanced CT scan shows fatty attenuation within the nodule with an HU value of 0 suggesting the possibility of an adenoma (arrow, B). FDG PET/CT shows no tracer concentration in the nodule, confirming the diagnosis of adenoma. Enhancing solid adrenal nodule on CT scan in another patient of lung cancer (arrow, D), which is indeterminate in nature. FDG PET/CT shows abnormal focal tracer concentration in the nodule (arrow, E) highly suggestive of a metastatic deposit via<https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4419420/figure/F11/><ref name="PurandareRangarajan2015">{{cite journal|last1=Purandare|first1=NilenduC|last2=Rangarajan|first2=Venkatesh|title=Imaging of lung cancer: Implications on staging and management|journal=Indian Journal of Radiology and Imaging|volume=25|issue=2|year=2015|pages=109|issn=0971-3026|doi=10.4103/0971-3026.155831}}</ref>]]
|[[Image:IJRI-25-109-g012.jpg|thumb|300px|Brain metastases in asymptomatic patient, CT scan versus MRI. MRI brain in a patient of lung cancer shows multiple tiny enhancing foci scattered in the parenchyma bilaterally (arrows in A and B) suggestive of metastatic lesions. Corresponding contrast CT scan sections of the brain show no obvious lesions (C and D). Note the beam hardening effects due to bone, leading to a loss of resolution on the CT images (C and D)|thumb|Brain metastases in asymptomatic patient, CT scan versus MRI. MRI brain in a patient of lung cancer shows multiple tiny enhancing foci scattered in the parenchyma bilaterally (arrows in A and B) suggestive of metastatic lesions. Corresponding contrast CT scan sections of the brain show no obvious lesions (C and D). Note the beam hardening effects due to bone, leading to a loss of resolution on the CT images (C and D)via<https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4419420/figure/F12/><ref name="PurandareRangarajan2015">{{cite journal|last1=Purandare|first1=NilenduC|last2=Rangarajan|first2=Venkatesh|title=Imaging of lung cancer: Implications on staging and management|journal=Indian Journal of Radiology and Imaging|volume=25|issue=2|year=2015|pages=109|issn=0971-3026|doi=10.4103/0971-3026.155831}}</ref>]]
|}


=== Diagnostic Criteria ===
*Unfortunately, research has shown that there are a number of false positives associated with CT scanning because a CT scan on its own cannot determine [[malignancy]].  
* Here you should describe the details of the diagnostic criteria.
*A positive result for a tumor using a CT scan is typically followed up with a [[biopsy]] for confirmation.
*Always mention the name of the criteria/definition you are about to list (e.g. modified Duke criteria for the diagnosis of endocarditis / 3rd universal definition of MI) and cite the primary source of where this criteria/definition is found.
*Although not necessary, it is recommended that you include the criteria in a table. Make sure you always cite the source of the content and whether the table has been adapted from another source.
*Be very clear as to the number of criteria (or threshold) that needs to be met out of the total number of criteria.
*Distinguish criteria based on their nature (e.g. clinical criteria / pathological criteria/ imaging criteria) before discussing them in details.
*To view an example (endocarditis diagnostic criteria), click [[Endocarditis diagnosis|here]]
*If relevant, add additional information that might help the reader distinguish various criteria or the evolution of criteria (e.g. original criteria vs. modified criteria).
*You may also add information about the sensitivity and specificity of the criteria, the pre-test probability, and other figures that may help the reader understand how valuable the criteria are clinically.
* [Disease name] is mainly diagnosed based on clinical presentation. There are no established criteria for the diagnosis of [disease name].
* There is no single diagnostic study of choice for [disease name], though [disease name] may be diagnosed based on [name of criteria] established by [...].


* The diagnosis of [disease name] is made when at least [number] of the following [number] diagnostic criteria are met: [criterion 1], [criterion 2], [criterion 3], and [criterion 4].
==References==
* The diagnosis of [disease name] is based on the [criteria name] criteria, which includes [criterion 1], [criterion 2], and [criterion 3].
{{reflist|2}}
 
[[Category:Disease]]
* [Disease name] may be diagnosed at any time if one or more of the following criteria are met:
[[Category:Types of cancer]]
** Criteria 1
[[Category:Pulmonology]]
** Criteria 2
[[Category:Lung cancer]]
** Criteria 3
 
IF there are clear, established diagnostic criteria:
*The diagnosis of [disease name] is made when at least [number] of the following [number] diagnostic criteria are met: [criterion 1], [criterion 2], [criterion 3], and [criterion 4].
*The diagnosis of [disease name] is based on the [criteria name] criteria, which include [criterion 1], [criterion 2], and [criterion 3].
*The diagnosis of [disease name] is based on the [definition name] definition, which includes [criterion 1], [criterion 2], and [criterion 3].
IF there are no established diagnostic criteria:
*There are no established criteria for the diagnosis of [disease name].


{{Tumors}}


==References==
{{WikiDoc Help Menu}}
{{Reflist|2}}
{{WikiDoc Sources}}
{{WH}}
[[Category:Up-To-Date]]
{{WS}}
[[Category:Oncology]]
[[Category:Medicine]]
[[Category:Pulmonology]]
[[Category:Surgery]]

Revision as of 18:52, 17 February 2018

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

Overview

Chest CT scan is the modality of choice in the diagnosis of lung cancer. Findings on CT scan suggestive of lung cancer include, a solitary pulmonary nodule, centrally located masses, mediastinal invasion CT scans help stage the lung cancer. A CT scan of the abdomen and brain can help visualize the common sights of metastases: adrenal glands, liver, and brain. CT scans diagnose lung cancer by providing anatomical detail to locate the tumor, demonstrating proximity to nearby structures, and deciphering whether lymph nodes are enlarged in the mediastinum.

CT Scan

Chest CT scan is the modality of choice in the diagnosis of lung cancer. Findings on CT scan suggestive of lung cancer include:[1]

Common radiological appearances of lung cancer. Centrally located mass with mediastinal invasion (arrow, A), peripherally situated mass abutting the pleura (arrow, B), mass with smooth, lobulated margins (arrow, C) and with spiculated, irregular margins (arrow, D), via <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4419420/figure/F1/>[1]
Lung cancers with atypical radiological pattern. Squamous cell cancer presenting as a cavitating mass (arrow, A). Adenocarcinoma presenting as dense consolidation (arrow, B). Bronchoalveolar carcinoma (adenocarcinoma in situ) presenting as ground-glass opacity (arrow, C) and mixed density, solid (arrow), and ground-glass nodules (arrowhead) in D via <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4419420/figure/F2/>[1]
Stage T1 and T2 tumors. Stage T1 tumor due to size <3 cm (arrow, A). Stage T2 endobronchial tumor (arrowhead) causing pneumonitis restricted to the upper lobe (arrow) in B. T2a tumor >3 cm but <5 cm (arrow, C). T2b tumor >5 cm but <7 cm (arrow in D) via <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4419420/figure/F3/>[1]
Stage T3 tumors. T3 tumor due to size >7 cm in size (arrow, A), eroding the ribs (arrow, B), infiltrating the mediastinal pleura but not the vessels (arrow, C), and causing atelectasis of the entire lung (arrowhead, D via<https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4419420/figure/F4/>.[1]
Stage T4 tumors. T4 tumor due to invasion of pulmonary artery (arrow, A), descending aorta (arrow, B), vertebral body (arrow, C), superior vena cava with thrombus (arrow, D)via<https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4419420/figure/F5/>[1]
Superior sulcus tumor. Axial (A) and coronal (B) CT scans show a large mass in the apex of the right lung causing destruction of the first and second ribs (arrows) with erosion of the right half of the vertebral body (arrowheads) suggestive of a superior sulcus tumor, via<https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4419420/figure/F16/>[1]

Spiral CT perfusion imaging

  • Spiral CT perfusion study can be used as a diagnostic method for peripheral pulmonary nodules.
  • Spiral CT perfusion study provides non-invasive method of quantitative assessment about the blood flow patterns of peripheral pulmonary nodules.
  • Spiral CT perfusion imaging is analyzed and evaluated for:.[2]]]
    • TDC (time density curve)
    • Perfusion parametric maps
    • The respective perfusion parameters.
    • Immunohistochemical findings of microvessel density (MVD) measurement
    • VEGF expression
(A-H) Poorly differentiated adenocarcinoma found in the apicoposterior segment of superior lobe of the left lung of a 56 year-old male. (A) Time density curve. (B-F) (original image, BF, BV, MTT, PS) typeI parametric maps, PS value is higher (30.883). (G) CD34 staining shows many immature tumor microvessels (× 200). (H) VEGF expression is strong positive (× 400) via, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2474637/figure/F6/.[2]
(A-H) (A-H) Well differentiated squamous cell carcinoma found in the posterior basal segment of inferior lobe of the right lung of a 61-year-old male. (A) Time density curve. (B-F) (original image, BF, BV, MTT, PS) TypeII parametric maps, PS value is higher (27.051). (G) CD34 staining shows many immature tumor microvessels (× 200). (H) VEGF expression is strong positive (× 400). via, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2474637/figure/F3/.[2]

CT Findings of Metastatic disease

  • CT scans help stage the lung cancer. A CT scan of the abdomen and brain can help visualize the common sights of metastases: adrenal glands, liver, and brain.
  • The benefits of CT Scans in lung cancer patients are the following:[3]
    • Provides anatomical detail to locate the tumor
    • Demonstrates proximity to nearby structures
    • Deciphers whether lymph nodes are enlarged in the mediastinum
Metastatic disease. Bilateral pleural effusions-M1a (arrow, A), lung metastases-M1a (arrows, B), adrenal metastasis-M1b (arrow, C), vertebral metastasis-M1b (arrow, D), brain metastasis-M1b (arrow, E), liver metastases-M1b (arrows, F)via<https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4419420/figure/F10/>This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.[1]
Adrenal adenoma versus metastasis. Enhancing solid adrenal nodule on CT scan in a case of lung cancer (arrow, A) suggestive of metastatic deposit. Unenhanced CT scan shows fatty attenuation within the nodule with an HU value of 0 suggesting the possibility of an adenoma (arrow, B). FDG PET/CT shows no tracer concentration in the nodule, confirming the diagnosis of adenoma. Enhancing solid adrenal nodule on CT scan in another patient of lung cancer (arrow, D), which is indeterminate in nature. FDG PET/CT shows abnormal focal tracer concentration in the nodule (arrow, E) highly suggestive of a metastatic deposit via<https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4419420/figure/F11/>[1]
Brain metastases in asymptomatic patient, CT scan versus MRI. MRI brain in a patient of lung cancer shows multiple tiny enhancing foci scattered in the parenchyma bilaterally (arrows in A and B) suggestive of metastatic lesions. Corresponding contrast CT scan sections of the brain show no obvious lesions (C and D). Note the beam hardening effects due to bone, leading to a loss of resolution on the CT images (C and D)via<https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4419420/figure/F12/>[1]
  • Unfortunately, research has shown that there are a number of false positives associated with CT scanning because a CT scan on its own cannot determine malignancy.
  • A positive result for a tumor using a CT scan is typically followed up with a biopsy for confirmation.

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Purandare, NilenduC; Rangarajan, Venkatesh (2015). "Imaging of lung cancer: Implications on staging and management". Indian Journal of Radiology and Imaging. 25 (2): 109. doi:10.4103/0971-3026.155831. ISSN 0971-3026.
  2. ↑ 2.0 2.1 2.2 Ma, Shu-Hua; Le, Hong-Bo; Jia, Bao-hui; Wang, Zhao-Xin; Xiao, Zhuang-Wei; Cheng, Xiao-Ling; Mei, Wei; Wu, Min; Hu, Zhi-Guo; Li, Yu-Guang (2008). "Peripheral pulmonary nodules: Relationship between multi-slice spiral CT perfusion imaging and tumor angiogenesis and VEGF expression". BMC Cancer. 8 (1). doi:10.1186/1471-2407-8-186. ISSN 1471-2407.
  3. ↑ Gerard A. Silvestri, Lynn T. Tanoue, Mitchell L. Margolis, John Barker, Frank Detterbeck.11/30/11.The Noninvasive Staging of Non Small-cell Lung Cancer. Chestpubs. http://chestjournal.chestpubs.org/content/123/1_suppl/147S.full/

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