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An infundibulum is normal anatomical variant, a dilatation at the origin of posterior communicating artery from internal carotid artery.
This does not require any further follow up.
However a small aneurysm can sometimes be mistaken as infundibulum.
Hence, in his case, given strong family history of intracranial hemorrage, a repeat MRI/MRA of the brain suggested after one year.
If no change in size, then this is not an aneurysm and no further follow up is needed if he does not have any symptoms.
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