The patient had a dissection of the left vertebral artery at the posterior inferior cerebellar artery (PICA ... It also showed an unruptured left superior hypophyseal artery aneurysm measuring 3 mm.

This case report presents a rare instance of an ectopic schwannoma originating from the internal carotid artery wall in a 21-year-old male, initially misdiagnosed as an anterior clinoid meningioma.

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