[Intracranial oncogenic aneurysm]

The paper deals with a death from cerebrosubarachnoidal hemorrhage in a 22-year-old male. Autopsy revealed fusiform aneurysm at the junction of right posterior connective and cerebral arteries whose wall was histologically examined. The examination indicated that the wall was invaded by tumor cells from the endothelium, the internal elastic membrane and vascular muscle layer being destructed. The primary cause of the tumor was a testis removed 40 days before the death and diagnosed as having chorionepithelioma.