Cerebral sacular aneurysms typically occur in the middle cerebral artery within the Circle of Willis. It is a ballooning of the artery that can be caused by a variety of things. It has been thought to be congenital, but recently this has been thought to be incorrect. It can also be caused by polycystic kidney disease, degenerative vascular disease, cocaine use, trauma, tumor, or infection. Symptoms range from none to headache, nausea, distorted vision, and loss of consciousness. MRI and MR Angiography can be used to diagnose sacular aneurysms. The image on the left is an MRA and the image of the right is an MRI FLAIR. Treatement involves surgical placement of coils or clips.
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