Superior and laterally directed irregular wall aneurysm arising from P1 and P2 junction of left posterior cerebral artery measuring 7.8mm(height)x 8.3mm (body ) x 3.6mm (neck ) . The CT angiogram shows a large sac containing thrombus external to the patent portion of the aneurysm. No high-grade stenosis is shown. The left vertebral artery is dominant, the right very small calibre. Normal aortic arch configuration without significant atherosclerotic disease involving extracranial or intracranial vessels. Partially thrombosed aneurysm arising from the P1, P2 junction of left posterior cerebral artery. Site and morphology strongly suggest a dissecting aetiology. Assessment with MRI and MRA would also be valuable as a baseline for followup.
Balloon assist coiling followed by LVIS 2.5*17 stent placement.