Black and white: how many details can you see?

Classical radiology is based in the contrast between black (air) and white (soft tissue) and is still a valuable tool for diagnosis but the observation must be systematic. How many abnormalities you see in the next X-ray?

A: 1                     B:2            C:3             D:0

SOLUTION: 2. Pneumotorax (right superior sulcus) and subcutaneous air