Basilar tip aneurysm

Case contributed by Dr Ian Bickle


CT scan performed as an outpatient for an indication of headache.

Patient Data

Age: 50
Gender: Female

Round high attenuation lesion in prepontine region.

Normal appearances of the brain parenchyma.


6mm rounded signal void (PD) in the ventral to the pons just left of the midline, in keeping with a basilar tip aneurysm.

Case Discussion

Basilar tip aneurysm.  One form of posterior circulation cerebral aneurysm which account for only the minority of aneurysms with 90% occuring in the anterior circulation.

Cerebral aneurysms typically occur close to bifurcations, as with this one, which has the posterior cerebral artery immediately posteriorly.


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Case information

rID: 26504
Case created: 24th Dec 2013
Last edited: 9th Mar 2016
Inclusion in quiz mode: Included

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