title: Occult carcinoma of the lung presenting as spontaneous pneumothorax.
abstract: The fortuitous discovery of a microscopic focus of poorly differentiated adenocarcinoma at the site of air-leak in a patient who had presented with spontaneous pneumothorax is described.
mesh_terms: D000230:Adenocarcinoma / Q000150:complications / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006801:Humans; D008175:Lung Neoplasms / Q000150:complications / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D011030:Pneumothorax / Q000150:complications / Q000175:diagnosis*