Air bronchogram sign
A middle aged male presented with cough and fever since last one week.
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Airway surrounded by collection in alveolar spaces and loss of volume giving positive air bronchogram sign on right side.
Also noted is right sided pleural effusion.
Air bronchogram sign is non specific sign seen in benign as well as malignant conditions.
Consolidation or more commonly called as pneumonia is most common benign cause of this sign.
Broncho-alveolar carcinoma (BAC) is most common malignant lesion which gives positive air bronchogram sign.