The following chest x-rays are from 3 different patients. What could be the aetiology for the white-out left hemi thorax in each case?

CXR 1 is from a 80 year old who is febrile and dyspnoeic.

CXR 2 is from a 65 year old with right sided chest pain.

CXR 3 is from a 85 year old with dyspnoea and hypoxia.

Answer on 18/3/15.