The term fusiform aneurysm is used to describe an aneurysm based on its angioarchitecture1. Fusiform aneurysms are characterized by a spindle-shaped dilation of an artery. Fusiform aneurysms can be divided into two subgroups and account for approximately 5% of intracerebral aneurysms2:
Simple Fusiform Aneurysm
Simple fusiform aneurysms do not have a branching vessel and represent a spindle-shaped arterial dilation3.
Complicated Fusiform Aneurysm
Complicated fusiform aneurysms have at least one branching vessel arising from the spindle-shaped vascular dilation4.
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