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What is Air bronchogram sign is seen in? and explain in detail?
ANSWER: (B) ConsolidationREF: Grainger 4th e p. 311, Wolfgang 5th e p. 421, chapman 4th e p. 124,142Air bronchogram is a reliable sign of intrapulmonary pathology for which consolidation is most common cause.Causes of Air BronchogramInfective* PneumoniaInflammatory* Radiation pneumonitis* Progressive massive fibrosis* Edema* Fat embolismNeoplastic* Alveolar ca* Lymphoma* Lympho sarcoma* Metastasis* Kaposi sarcomaBlood in lungs* Infarction* Contusion* DIC* anticoagulants