Pedunculated pulmonary leiomyoma with large cyst formation.

A case of single pulmonary leiomyoma with giant cyst formation is presented. Metastasizing uterine fibroleiomyoma and fibroleiomyomatous hamartoma both give rise to multiple pulmonary nodules on chest films. Leiomyoma of the lung presenting as a single pedunculated lesion with cyst formation is exceptional. This report documents the existence of other rare cystic lesions that may mimic the more common cystic air space and bullous disease.