CT Brain Aneurysms - Video Lesson

Hey everybody, welcome back. This lesson is about brain aneurysms observed in CT imaging. Most brain aneurysms are simply called cerebral aneurysms. A cerebral aneurysm is an abnormal enlargement of a cerebral artery. The most common cerebral aneurysms are saccular or berry aneurysms, referring to their round berry like shape. They may rupture and cause subarachnoid hemorrhage. Almost all non traumatic subarachnoid hemorrhages are caused by a ruptured cerebral aneurysm. They present as an enlarged cerebral artery, typically within the circle of Willis. This patient is a good example. This is a three d rendered image of a CT angiography study, demonstrating a berry shaped cerebral aneurysm near the circle of Willis. We would call this a saccular aneurysm. The specific vessel affected is the right posterior cerebral artery. Here's an example of a saccular aneurysm on a different patient within the axial plane.