Intracranial aneurysms, also called cerebral aneurysms, are aneurysms of the intracranial arteries. The most common morphologic type is the saccular aneurysm, although a number of other morphologies and aetiologies occur.
Due to a combination of thinner/weaker walls and Laplace's law, aneurysms tend to enlarge progressively. This, in turn, can lead to rupture (and subarachnoid haemorrhage) or partial thrombosis (due to slow turbulent flow).
Pathology
There is not a universal classification for the types of intracranial aneurysms, resulting in a heterogeneous mix of terms based on the morphology, size, location, and aetiology 1,2:
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