Abstract
Mesenchymal cystic hamartoma is very rare. The patient was a 66-year-old woman admitted to our hospital because of a pulmonary cystic lesion, detected by chest computed tomography (CT). CT showed a cystic lesion with a septum and partial wall thickness. Based on these findings we suspected malignancy or aspergiloma. Video assisted thoracoscopic surgery was performed and the cystic lesion was resected from peripheral part of the right lower lobe. Pathologically, the tumor was composed of cartilage tissue and bronchial epithelium. From the pathological findings, the tumor was diagnosed as mesenchymal cystic hamartoma.
