We report the case of a 37-year-old woman with a radiographically cystic lu
ng lesion. Lobectomy was performed. Histopathologic examination showed a br
onchioloalveolar carcinoma arising in a bronchogenic cyst. This suggests th
at epithelial cells of bronchogenic cysts can undergo malignant transformat
ion. It may be prudent to recommend complete resection of any bronchogenic
cyst. (C) 2000 by The Society of Thoracic Surgeons.