Vascular loop refers to the bend or coil of the anterior inferior cerebellar artery (AICA) in the cerebellopontine angle (CPA) or the internal auditory canal (IAC) that occurs in close proximity to the vestibulocochlear nerve. It is thought to be related to unilateral symptoms of tinnitus, vertigo, and sensorineural hearing loss, but its true clinical significance remains controversial. Postmortem and radiographic studies have not revealed consistent relationships between the presence and types of AICA loops and cochleovestibular symptoms.
Radiology Case Quiz 2: Diagnosis. Arch Otolaryngol Head Neck Surg. 2007;133(11):1165. doi:10.1001/archotol.133.11.1165