A Case of Giant IC-PC Aneurysm

Abstract

The internal carotid-posterior communicating artery junction (IC-PC) is one of the most common sites of aneurysm formation. But giant aneurysms arising from this site are very rare. We report a case of giant IC-PC aneurysm with brainstem compression successfully treated by neck clipping.
A 74-year-old female was admitted to our department because of gait disturbance. Neurological examination on admission was normal except for mild swallowing disturbance. CT scan and MR image demonstrated a mass lesion compressing the right cerebral peduncle in the basal cistern. A cerebral angiogram revealed an IC-PC aneurysm on the right side. Therefore, we diagnosed her illness as a partially thrombosed giant IC-PC aneurysm. She underwent right frontotemporal craniotomy followed by neck clipping and thrombectomy with preserved patency of both the anterior choroidal and posterior communicating artery. The postoperative course was uneventful except for transient right occlomotor palsy.