[A case of "true" posterior communicating artery aneurysm (author's transl)].

A 57-year-old woman complained of severe headache and vomiting of a week's duration. Spinal tap showed bloody CSF and cerebral angiography revealed the "true" posterior communicating artery aneurysm. Left frontotemporal osteoplastic craniotomy and trapping of the aneurysm were performed on August 28, 1979. After operation right hemiplegia, left oculomotor palsy and the disturbance of consciousness developed. Postoperative CT scan showed a hemorrhagic infarction at the left basal ganglia. Since then she has been getting better and was discharged, able to walk, from our hospital 6 months after operation. We considered the anatomical importance of perforating arteries from posterior communicating artery and propose that true posterior communicating artery aneurysm should be classified separately from our experiences and literature.