A rare case of swyer-james macleod syndrome and a new clinical presentation, acquired lobar emphysema.

Swyer-James Macleod syndrome is a radiologic entity characterized by hyperlucency of one or more lobes or of the entire lung, decreased number and diameter of ipsilateral peripheral pulmonary vessels, and difficult visibility of the arterial network and unobstructed bronchial system. A 21-year-old male was admitted to our clinic on the observation of left hemithoracic hyperinflation on chest radiography. Preoperative evaluation revealed an increase of ventilation to the left lower lobe and the deletion of peripheral vascular structures. Scintigraphy revealed a perfusion defect in the left lower lobe. In this patient with congenital left upper lobe hypoplasia and Swyer-James Macleod syndrome in the lower half of the lower lobe, I present the coexistence of these two rare clinical entities and "acquired lobar emphysema."