Basilar tip aneurysm

Case contributed by Dr Ian Bickle


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

Patient Data

Age: 50 years
Gender: Female

Round high attenuation lesion in prepontine region.

Normal appearances of the brain parenchyma.


6 mm 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% occurring 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
Published: 24th Dec 2013
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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