[Solitary papilloma of the lung: a case report].

A case of solitary papilloma of pulmonary parenchyma is presented. The patient was a 47-year-old woman admitted our clinic because of a mass shadow on routine chest films. The operation was performed without definitive diagnosis of the tumor. Intraoperative frozen specimen revealed to be either papilloma or squamous cell carcinoma. So right upper and middle lobectomies with mediastinal lymph nodes dissection were performed. When a definite diagnosis cannot be proved to be papilloma even at surgery, treatment as a lung cancer should be performed. Solitary benign papilloma like this case is very rare. According to the literature, this case seems to be the first Japanese case of solitary papilloma in pulmonary parenchyma.