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Posterior Inferior Cerebellar Artery Aneurysm

Last Updated: September 28, 2018

Clip Ligation of a Posterior Inferior Cerebellar Artery (PICA) Aneurysm

Challenging Atherosclerotic PICA Aneurysm

Like all other cerebral aneurysms, posterior inferior cerebellar (PICA) aneurysms are most frequently diagnosed either after their rupture or incidentally via imaging for an unrelated symptom such as headaches. After basilar apex aneurysms, PICA aneurysms are the most common posterior circulation aneurysm subtype.

Upon its rupture, the proximity of the aneurysm to the medulla oblongata is likely to lead to a loss of consciousness, as well as respiratory and cardiac arrest. Large aneurysms can rarely present with symptoms and signs of brainstem and lower cranial nerve dysfunction. Embolic phenomenon from thrombotic aneurysms can lead to lateral medullary (Wallenberg) syndrome.