Abstract
A 28-years-old female was the only one case who had an aneurysm arising from the posterior communicating artery itself in a total of 1, 080 cases of saccular aneurysms handled by our clinic. Most of the so-called posterior communicating artery aneurysms are actually internal carotid-posterior communicating artery junction aneurysms. The incidence of aneurysms arising from the posterior communicating artery itself is reported to be 0 to 3.3% of the total cases. In our case, treatment by trapping at the posterior communicating artery was performed.
