TRANSLUCENT HEMITHORAX ON CXR

unilateral pulmonary oligaemia:

pulmonary embolism

congenital pulmonary artery hypoplasia

external compression of pulmonary artery:

aortic aneurysm

bronchial carcinoma

fibrosing mediastinitis

constrictive pericarditis

other / miscellaneous:

obstructive hyperinflation (foreign body)

'unilateral pulmonary emphysema'

large pneumothorax (+ mediastinal shift if tension)

large bulla

lower lobe collapse (hilum pulled downwards)

post-mastectomy

congenital absence of pectoralis major

MacLeod's syndrome

rotated CXR or kyphoscoliosis

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