Our data show that double origin of the PICA is seen in 4.1% of patients with intracranial aneurysm and on 1.45% of catheter angiograms. Double origin of the PICA has an increased association with intracranial aneurysmal disease and may represent a risk factor for subsequent development of intracranial aneurysm.
IPEH can develop in a relatively short time, can present as a hypervascular mass lesion or within an intracranial aneurysm, and should be completely resected to prevent recurrence.
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