Infected cystic adenomatoid malformation in an adult.

Congenital cystic adenomatoid malformation of the lung is rare in adults. We present a 51-year-old man with recurrent lower respiratory tract infections and intermittent febrile episodes for more than 10 years. Multiple cavitary lesions with fluid accumulation were seen in the right lower lobe of the lung on radiography and computed tomography of the chest. Wedge resection of the right lower lobe of the lung was performed through a mini-thoracotomy using video-assisted thoracoscopy. Multiple infected cysts were found in a 10 x 8 x 6 cm area of lung. The histologic diagnosis was infected type I congenital cystic adenomatoid malformation. The patient remains well 1 year after the operation.