[Birt-Hogg-Dubé Syndrome Incidentally Found at Chest Trauma;Report of a Case].

Birt-Hogg-Dubé syndrome (BHDS) is usually diagnosed at the incidence of pneumothorax. A 65-year-old male fell from the stairs in his house and was injured. Chest computed tomography (CT) revealed fractures of right 1st rib and sternum and hematoma in mediastinum. Irregular shaped pulmonary cyst on the interlobar, mediastinal and diaphragm surface were found by chest CT. White-toned papules were observed from right nosewing to the neck. By biopsies, it was diagnosed fibrofolliculomas. Genetic analysis showed substitution in the folliculin gene confirming the diagnosis of BHDS.