An adult case of congenital cystic adenomatoid malformation of the lung found at a medical check-up

Abstract

A 20-year-old man was admitted because of an abnormal shadow on chest X-ray film. Chest CT showed large cystic shadows and many small cystic shadows in the right lower lobe. He underwent right lower lobectomy of the lung under the diagnosis of cystic lung disease. Microscopically, cyst walls were covered by ciliated columnar cells and lacked cartilage. These findings supported the diagnosis of congenital cystic adenomatoid malformation of the lung (CCAM). CCAM presents respiratory distress mainly in neonates and presents pulmonary infectious signs in adults. It is rare for CCAM to be found by a chest X-ray film of medical check-up.