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| [[Papulosquamous erythematous rash]] | | [[Papulosquamous erythematous rash]] |
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| ==DDx==
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| {{ddx0|Legionnaires' disease}}
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| {{ddx1|Acute interstitial pneumonia}}
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| {{ddx1|Mycoplasma pneumonia}}
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| {{ddx1|Pneumococcal pneumonia}}
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| {{ddx1|Pneumocystis carinii pneumonia}}
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| {{ddx1|Pulmonary embolism}}
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| {{ddx1|Streptococcal pneumonia}}
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| {{ddx1|Viral pneumonia}}
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| ----
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| {{ddx|Legionnaires' disease}}
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| =====Clinical manifestations=====
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| * Adult respiratory distress syndrome
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| * Bronchial breath sounds
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| * Dry cough
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| * High grade fever
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| * Progressive dyspnea
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| =====Laboratory abnormalities=====
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| * Legionella urinary antigen positive
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| * Leukocytosis with relative lymphopenia
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| * Hyponatremia
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| * Hypophosphatemia
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| =====Radiographic features=====
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| * Alveolar consolidation on chest radiograph
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| * Lobar consolidation on chest radiograph
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| ----
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| {{ddx|Acute interstitial pneumonia}}
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| =====Clinical manifestations=====
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| * Dry cough
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| * Progressive dyspnea
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| =====Laboratory abnormalities=====
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| * Nonspecific
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| =====Radiographic features=====
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| * Disseminated consolidation on chest radiograph
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| * Interstitial infiltrate on chest radiograph
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| * Increased uptake on gallium scan
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| -----
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| {{ddx|Mycoplasma pneumonia}}
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| =====Clinical manifestations=====
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| * Dry cough
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| * Pleuritic chest pain
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| * Bronchial breath sounds
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| * Inflammed, opaque, hypomobile tympanic membrane
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| =====Laboratory abnormalities=====
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| * Lymphocytosis
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| * Cold agglutinins positive
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| =====Radiographic features=====
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| * Alveolar consolidation on chest radiograph
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| * Interstitial infiltrate on chest radiograph
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| * Lobar consolidation on chest radiograph
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| ----
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| {{ddx|Pneumococcal pneumonia}}
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| =====Clinical manifestations=====
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| * High grade fever
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| * Hemoptysis
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| * Fine rales
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| * Pleuritic chest pain
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| * Increased breath sounds
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| * Bronchial breath sounds
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| * Dullness on chest percussion
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| * Purulent sputum
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| * Shallow respiration
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| * Pectoriloquy
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| * Increased tactile fremitus
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| * Productive cough
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| * Egophony
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| =====Laboratory abnormalities=====
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| * Gram positive diplococci on sputum Gram stain
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| * Pleural effusion (exudative)
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| * Respiratory alkalosis
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| =====Radiographic features=====
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| * Parenchymal hyperlucency on chest radiograph
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| * Increased uptake on gallium scan
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| * Unilateral diaphragm elevation on chest radiograph
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| * Alveolar consolidation on chest radiograph
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| * Lobar consolidation on chest radiograph
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| ----
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| {{ddx|Pneumocystis carinii pneumonia}}
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| =====Clinical manifestations=====
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| * Immunosuppressive state
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| * Subcutaneous emphysema
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| * Hacking cough
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| * Progressive dyspnea
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| =====Laboratory abnormalities=====
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| * Respiratory alkalosis
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| * Serum beta-D-glucan elevation
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| =====Radiographic features=====
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| * Alveolar consolidation on chest radiograph
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| * Lobar consolidation on chest radiograph
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| * Interstitial infiltrate on chest radiograph
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| * Pneumomediastinum on chest radiograph
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| ----
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| {{ddx|Pulmonary embolism}}
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| =====Clinical manifestations=====
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| * Calf pain or swelling
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| * Decreased pulse pressure
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| * Dyspnea
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| * Hemoptysis
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| * Hyperventilation
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| * Immobility
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| * Increased pulmonic component of heart sound
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| * Pleuritic chest pain
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| * Prior DVT
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| * Pulmonary hypertension
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| * Right ventricular heave
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| * Right-to-left shunt
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| * Substernal chest pain
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| * Tachypnea
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| * Thrombophlebitis
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| * Venous stasis
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| * Bone fracture
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| =====Laboratory abnormalities=====
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| * D-dimer elevation
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| * Hypocapnia
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| * Hypoxia
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| * Pleural effusion (exudative or bloody)
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| * Atrial fibrillation on ECG
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| * Right axis deviation on ECG
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| * Right ventricular overload on ECG
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| =====Radiographic features=====
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| * Normal chest radiograph
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| * Atelectasis on chest radiograph
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| * Lobar consolidation on chest radiograph
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| * Prominent pulmonary artery on chest radiograph
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| * Hampton's hump on chest radiograph
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| * Right ventricular enlargement on echocardiography
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| * Thrombus on echocardiography
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| * Segmental perfusion defect on lung scan
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| * V/Q mismatch on lung scan
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| ----
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| {{ddx|Streptococcal pneumonia}}
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| =====Clinical manifestations=====
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| * Pectoriloquy
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| * Bronchial breath sounds
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| * Erythema nodosum
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| * Purulent sputum
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| * Shallow respiration
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| * Increased tactile fremitus
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| * Pleuritic chest pain
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| * Egophony
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| =====Laboratory abnormalities=====
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| * Gram-positive cocci in chains on sputum Gram stain
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| * Respiratory alkalosis
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| * Pleural effusion (exudative)
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| =====Radiographic features=====
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| * Alveolar consolidation on chest radiograph
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| * Lobar consolidation on chest radiograph
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| * Empyema on chest radiograph
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| * Increased uptake on gallium scan
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| ----
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| {{ddx|Viral pneumonia}}
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| =====Clinical manifestations=====
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| * Pleuritic chest pain
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| * Bronchial breath sounds
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| * Recent influenza
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| * Fine rales
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| * Bronchovesicular breath sounds
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| =====Laboratory abnormalities=====
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| * Lymphocytosis
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| * Respiratory alkalosis
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| =====Radiographic features=====
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| * Lobar consolidation on chest radiograph
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| * Interstitial infiltrate on chest radiograph
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| ==References==
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| {{reflist|2}}
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