[Fusiform arterial dilations of the vessels of the posterior cranial fossa].

In a 28-year-old woman with symptomatic cerebral convulsions, vertebral angiography showed two spindle-like dilatations which are probably located in the vascular province of the A. cerebelli superior. The EEG showed convulsive activities, the PEG a beginning hydrocephalus. Neurological findings and fundoscopy were normal. Lues could be ruled out. Differentiation from a cerebral phlebectasia, which is also rare, was reliably possible. An association between the vascular dilatations and the convulsions is not assumed.