Basilar tip aneurysm with coiling

Case contributed by Matt A. Morgan


Presents with headache, nausea, and blurry vision. Intact on neurological exam, but has "worst headache of life". CT ordered in the emergency department for further evaluation.

Patient Data

Age: 65 years old
Gender: Female

There is an 8 x 10 mm lobular area of hyperattenuation anterior to the midbrain. A tiny amount of hyperattenuation along the right central sulcus is compatible with a small amount of subarachnoid hemorrhage

CT Angiogram


Better evaluation of a bilobed aneurysm at the tip of the basilar artery. No other aneurysm identified. The patient was then taken for cerebral angiography and intervention.

Angiogram with endovascular coiling


Right vertebral artery injection:

Irregular bilobed basilar artery tip aneurysm:

  • left lobe measures 8 x 6 x 4 mm
  • right lobe measures 9 x 7 x 4 mm
  • the aneurysm is partially incorporating origin of the right posterior cerebral artery P1 segment, with anterior pointed lobulation worrisome for potential site of rupture
  • small left sided fenestration at the vertebrobasilar junction. Otherwise unremarkable angiographic appearance of the right distal V2, V3 and V4 segments, right posterior inferior cerebellar artery, as well as the basilar artery and its branches, including the bilateral posterior cerebral arteries.

Subsequent coiling of the aneurysms with platinum microcoils.


Post coiling streak artifact.

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