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Disease Clinical manifestations Diagnosis
Symptoms Physical exam Lab findings Imaging Gold standard
Cough Dyspnea Hemoptysis Fever History/Exposure Cyanosis Clubbing JVD Peripheral edema Auscultation Other prominent findings CXR CT DLCco
Acute Respiratory Distress Syndrome (ARDS) - + - - Inciting event, such as: + - - -
  • Initially respiratory alkalosis transforming to respiratory acidosis
  • BNP level of less than 100 pg/mL
  • PaO2 / FiO2 <300
  • CBC
    • Leukopenia
    • Leukocytosis
    • Thrombocytopenia
  • Bilateral pulmonary infiltrates
    • Initially patchy peripheral
    • Later diffuse bilateral
  • Ground glass
  • Frank alveolar infiltrate
  • Bronchial dilatation within areas of ground-glass opacification
↓
  • PaO2 / FiO2 <300
Bronchitis Acute + - +/- + - - - - -
  • Diffuse wheezes
  • High-pitched continuous sounds
  • The use of accessory muscles 
  • Prolonged expiration
  • Rhonchi
  • Rales
  • N/A
  • Normal
  • N/A
↓
  • Clinical diagnosis
Chronic + + - -
  • A positive history of chronic productive cough 
  • Shortness of breath 
+ - + +
  • Prolonged expiration; wheezing
  • Diffusely decreased breath sound
  • Coarse crackles with inspiration
  • Coarse rhonchi
  • Radiolucency
  • Diaphragmatic flattening due to hyperinflation
  • Increased retrosternal airspace on the lateral radiograph
  • N/A
-
Hypersensitivity Pneumonitis + + - +
  • History of allergen exposure
- + - -
  • Constitutional symptoms
    • Weight loss
    • Anorexia
    • Muscle weakness
  • Neutrophilia
  • Elevated ESR
  • Elevated CRP
  • Elevated immunoglobulin
  • No peripheral blood eosinophilia
  • Poorly defined micronodular or diffuse interstitial pattern
  • In chronic form
    • Fibrosis
    • Loss of lung volume
    • Coarse linear opacities
  • Ground-glass opacities or
  • Diffusely increased radiodensities
  • Diffuse micronodules
  • Focal air trapping
  • Mosaic perfusion
  • Occasionaly thin-walled cysts
  • Mild fibrotic changes 
↓
Pneumoconiosis[1] SIlicosis[2][3] + + +/- -
  • History of substantial exposure to silica dusts
  • Occupational history
    • Sandblasting
    • Bystanders
    • Quartzite miller
    • Tunnel workers
    • Silica flour workers
    • Workers in the scouring powder industry
+ + + -
    • Lungs are hyperresonant
    • Finecrackles upon auscultation of the lung bases or apices, unilaterally or bilaterally
    • Rhonchi
    • Bronchial breath sounds
    • Expiratory wheezing with normal or delayed expiratory phase
    • Wheezing may be present
    • Egophony present
    • Bronchophony present
    • Increased tactile fremitus.
    • Loud P2
  • Increased susceptiblity to tuberculosis.
  • Respiratory acidosis
  • Abnormal sputum
  • CBC
    • Anemia
    • Neutrophilia
    • Elevated ESR,
    • Elevated CRP
    • Elevated immunoglobulin
  • Small round opacities
    • Symmetrically distributed
    • Upper-zone predominance
  • Diffuse interstitial pattern of fibrosis without the typical nodular opacities in chronic case
  • Nodular changes in lung parenchyma
  • Progressive massive fibrosis
  • Bullae, emphysema
  • Pleural, mediastinal, and hilar changes
↓
  • Lung biopsy
Asbestosis
  • Shipyard workers
  • Pipe fitting
  • Insulators
  • Lung cancer
  • Mesothelioma
  • Predilection to lower lobes
  • Fine and coarse linear, peripheral, reticular opacities
  • Subpleural linear opacities seen parallel to the pleura
  • Basilar lung fibrosis
  • Peribronchiolar, intralobular, and interlobular septal fibrosis;
  • Honeycombing
  • Pleural plaques.
Berylliosis 
  • Electronic manufactures
  • Hilar adenopathy
  • Increased interstitial markings.
  • Ground glass opacification
  • Parenchymal nodules
  • Septal lines
Byssinosis 
  • Cotton wool workers
  • Increased susceptibility to Actinomyces and Aspergillus infection.
  • Diffuse air-space consolidation
  • Pulmonary fibrosis with honeycombing
  • Peri bronchovascular distribution of nodules
  • Ground-glass attenuations
Sarcodiosis + + + +
  •  African Americans
  • Autoimmune
- - - -
  • Usually normal
  • Crackles may be audible
  • Dermatologic manifestations
  • Ocular involvement
  • Osseous involvement
  • Heart failure from cardiomyopathy
  • Lymphocytic meningitis
  • Cranial nerve palsies
  • Hypercalcemia or hypercalciuria 
  • Elevated 1, 25-dihydroxyvitamin D levels
  • Elevated angiotensin-converting enzyme (ACE)
  • Bilateral hilar lymphadenopathy
  • High-resolution CT (HRCT) scanning of the chest may identify
    • Active alveolitis
    • Fibrosis
↓
  • Biopsy
    • Non-caseating granuolma
Pleural Effusion + + +/- +/- Transudate
  • Congestive heart failure
  • Cirrhosis (hepatic hydrothorax)
  • Atelectasis (may be due to occult malignancy or pulmonary embolism)
  • Hypoalbuminemia
  • Nephrotic syndrome

Exudate

  • Parapneumonic causes 
  • Malignancy (most commonly lung or breast cancer, lymphoma, and leukemia; less commonly ovarian carcinoma, stomach cancer, sarcomas, melanoma) 
  • Pulmonary embolism
  • Collagen-vascular conditions (rheumatoid arthritis, systemic lupus erythematosus 
  • Tuberculosis (TB)
  • Pancreatitis
+/- +/- +/- +/-
  • Dullness to percussion
  • Decreased tactile fremitus,
  • Asymmetrical chest expansion,
  • Diminished or delayed expansion on the side of the effusion: 
  • Diminished or inaudible breath sounds
  • Pleural friction rub
  • Peripheral edema, distended neck veins, and S3 gallop suggest congestive heart failure.
  • Edema may also be a manifestation of nephrotic syndrome, pericardial disease, or, when combined with yellow nailbeds, the yellow nail syndrome.
  • Cutaneous changes and ascites suggest liver disease.
  • Lymphadenopathy or a palpable mass suggests malignancy.
  • Thoracentesis 
    • Exudate
    • Transudate
    • LDH, Glucose, cytology
  • Other specific labs of underlying etiology
Supine
  • Blunting of the costophrenic angle
  • Homogenous increase in density spread over the lower lung fields

Lateral decubitus

  • Free flowing effusion as layers
  • Thickened pleura
  • Mild effusions can aslo be detected
↓
  • Thoracocentesis
Neuromuscular disease Scoliosis - + - -
  • Postural abnormality
- - - -
  • Decreased breathe sounds
  • In severe scoliosis, the rib cage may press against the lungs making it more difficult to breathe.
  • R/0 genetic conditions
    • Marfan's syndrome
    • Edward's syndrome
  • Total lymphocyte count (should be >1500/μL)
  • Nutritional status must be assessed
  • Accurate depiction of the true magnitude of the spinal deformity can be assessed by supine anteroposterior (AP) and lateral spinal radiographs
  • N/A
  • Clinical
  • Radiographs
Muscular dystrophy - + - -
  • Proximal muscle weakness (shoulder and pelvic girdle)
- - - -
  • Decreased breathe sounds
  • Decreased chest expansion
  • Rash
  • Elevated CPK and aldolase
  • +ANA
  • +Anti-Jo abs
  • Elevated ESR, CRP and RF
  • N/A
  • N/A
  • Muscle biopsy
ALS - + - -
  • Muscle weakness
- - - -
  • Decreased breathe sounds
  • Decreased chest expansion
  • Symptoms begin with limb involvement diue to muscle weakness and atrophy. 
  • Cognitive or behavioral dysfunction
  • Sensory nerves and the autonomic nervous system are generally unaffected
N/A Not significant/diagnostic Not significant/diagnostic -
  • Clinical diagnosis
  • Nerve conduction studies and needle electromyography (EMG) 
Myasthenia gravis - + - + H/O of difficulty getting up from chair
  • Combing
  • Difficulty in swallowing
- - - -
  • Decreased breathe sounds
  • Decreased chest expansion
  • Extraocular, bulbar, or proximal limb muscles.
  • Breathing as rapid and shallow,
  • Respiratory muscle weakness can lead to acute respiratory failure may require immediate intubation.
  • Anti–acetylcholine receptor (AChR) antibody (Ab) test +
  • Thymoma as an anterior mediastinal mass.
  • Thymoma as an anterior mediastinal mass.
  • Electromyography
Interstitial (Nonidiopathic) Pulmonary Fibrosis + ++ + -
  • Connective-tissue disorder
  • Pneumoconiosis
+ + + +
  • Wheezing
  • S3
  • P2
  • End-inspiratory rales
  • Increased A-a gradient
  • Elevated ESR
  • Serologic testing for ANA, RF, ANCA & ASCA may be positive
  •  Reticular and/or nodular opacities
  • Honeycomb appearance (late finding)
  • Bilateral reticular and nodular interstitial infiltrates
↓ Video-assisted thoracoscopic lung biopsy
Lymphocytic Interstitial Pneumonia + + + +
  •  Autoimmune
  • Lymphoproliferative disorders
- + - -
  • Wheezing
  • Rales
  • Increased A-a gradient
  • Polyclonal hypergammaglobulinemia
  • Increased LDH
  • Bibasilar interstitial or micronodular infiltrates
  • Determines the degree of fibrosis
  • Cysts (characterstic)
N Open lung biopsy
Obesity + + - -
  • Overweight
  • Diabetes mellitus
  • Asthma
- - - +
  • Wheezing
  • Increased hematocrit
  • X ray findings are often limited due to body habitus
  • CT findings are variable and depends upon severity of obesity
N Clinical
Pulmonary Eosinophilia + + + + Infections
  • Prasitic
  • Fungal
  • Mycobacterial
+ - + +
  • Wheezing
  • Rales
  • Increased A-a gradient
  • Leukocytosis with eosinophilia (> 250/µL)
  • Interstitial or diffuse nodular densities
  • Determines extent and distribution of the disease
  • Interstitial infiltrates
  • Cysts and nodules
↓ Biopsy of lesion (skin or lung)
  1. ↑ Gay SE, Kazerooni EA, Toews GB, Lynch JP, Gross BH, Cascade PN, Spizarny DL, Flint A, Schork MA, Whyte RI, Popovich J, Hyzy R, Martinez FJ (1998). "Idiopathic pulmonary fibrosis: predicting response to therapy and survival". Am. J. Respir. Crit. Care Med. 157 (4 Pt 1): 1063–72. doi:10.1164/ajrccm.157.4.9703022. PMID 9563720.
  2. ↑ du Bois RM (2006). "Evolving concepts in the early and accurate diagnosis of idiopathic pulmonary fibrosis". Clin. Chest Med. 27 (1 Suppl 1): S17–25, v–vi. doi:10.1016/j.ccm.2005.08.001. PMID 16545629.
  3. ↑ Neghab M, Mohraz MH, Hassanzadeh J (2011). "Symptoms of respiratory disease and lung functional impairment associated with occupational inhalation exposure to carbon black dust". J Occup Health. 53 (6): 432–8. PMID 21996929.