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Basilar tip aneurysm

Case contributed by Ian Bickle
Diagnosis certain

Presentation

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

Patient Data

Age: 50 years
Gender: Female
ct

Round high attenuation lesion in prepontine region.

Normal appearances of the brain parenchyma.

mri

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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