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Miliary shadows on CXR

CWP & silicosis, MS sarcoidosis, Hyperparathyroidism, Eosinophilic granuloma (Histiocytosis X), Blastomycosis, coccidiomycosis, histoplasmosis, streptococcal pneumonitis, VZV (But not staph).
 
THORAX
THE SILHOUETTE SIGN
Silhouette sign is used mainly for localizing intrathoracic lesion.
SIGN LESION OF
Obscured right heart border:
Obscured left heart border
Hemidiaphragm
Aortic knuckle
Ascending aorta
Descending aorta
--- right middle lobe (ant. segment) lesion,
--- Lingular lobe / left lower lobe.
--- Relative lower lobe.
--- apico-posterior segment of left upper lobe.
--- Ant. segment of right upper lobe.
--- Sup. & posterobasal segment of left lower lobe.
 
Pneumomediastinum

Hamman’s sign +ve
  1. Lung tear
  2. Asthma
  3. Artificial ventilation
  4. Esophageal perforation
  5. Spontaneous (MC cause)
  6. Diabetic ketoacidosis
  7. Histiocytosis
  8. Respiratory distress syndrome




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