気管支壁外へ進展した気管支内脂肪腫性過誤腫の1例

Endobronchial Lipomatous Hamartoma Extended beyond a Bronchial Wall：Report of a Case

はじめに　気管支内型過誤腫は比較的まれな腫瘍である．われわれは，気管支壁外へ発育した気管支内脂肪腫性過誤腫の症例を経験したので報告する．

Pulmonary hamartomas are common benign lung tumors. Most cases are parenchymal chondromatous hamartomas, whereas endobronchial lipomatous hamartomas are rarely encountered. A 78-year-old man was referred for left superior subsegmental atelectasis due to obstruction by an endobronchial tumor that was found incidentally on chest computed tomography for the postoperative follow-up of colon cancer. Bronchoscopy showed a polypoid tumor in the orifice of the left upper segmental bronchus. Lipoma was diagnosed by a bronchoscopic biopsy. We performed a segmentectomy of the upper division of the left lung because the tumor was presumed to be located peripherally to the left B3 segmental bronchus. A histopathological examination revealed that the tumor was an endobronchial lipomatous hamartoma that extended to the pulmonary parenchyma beyond the bronchial wall.