[Bifrontal cystic tumor--a form of suprasellar germinoma (author's transl)].

Twenty year old boy was admitted because of a recent history of generalized seizures and papilledema. Neurological examination was essentially negative except papilledema in the both optic fundi. A history of polydipsia or polyuria was not obtained. CT scan showed bifrontal cystic lesions and cyst walls were partly enhanced. Midline frontal nodules around the foramen of Monro were also revealed by enhancement. Operation was performed and biopsy specimen showed typical histology of germinoma with a small focus of squamous epithels. Postoperatively, the patient's urinary output increased temporalily up to 5,000 ml per day under steroid administration. Shortly after irradiation, cysts decreased in size and all enhanced lesions disappeared completely. The patient is fully working without disturbance one and half year after the onset. Close relationship of germinoma and teratoma was briefly reviewed in literature.