Small saccular aneurysm (white arrow) arising from origin of ophthalmic artery (black arrow).http://www.ajronline.org/cgi/content/full/184/1/305#FIG7
CT angiography, axial. Sentinel clot (arrowheads) around saccular aneurysm (arrow) arising from right internal carotid artery. Causes: developmental or degenerative, traumatic, mycotic, oncotic, flow-related, vasculopathy-related, and drug related.
Associated conditions: polycystic kidney disease, coarctation of aorta, anomalous vessels, FMD, connective tissue disorders, high-flow states, and spontaneous dissections.
Treatment: clipping or coiling (coiling with or without stent).
Saccular aneurysms are berry shaped outpouchings that arise from arterial bifurcation points. The most common area inthe cirlce of Willis. They present dilations of the vascular lumen which is caused by weakening of all vessel wall layers.
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