This term was given by McKenzie in 1936 and popularized by Janetta in 1975. The term vascular compression syndrome refers to the group of diseases caused by mechanical irritation of cranial nerve by other tissues, usually a blood vessel. Hence, due to its anatomical course, AICA is commonly involved in various compression syndromes. In some 20–40% cases, a loop of AICA also enters IAC. ĪICA is a branch of basilar artery and gives off a labyrinthine artery that enters the internal auditory canal, along with the facial nerve, vestibulocochlear nerve, and nervus intermedius. Besides, these cranial nerves-CSF, arachnoid tissue, and anteroinferior cerebellar artery (AICA)-form other important contents of the CP angle. The cerebellopontine angle is an important region in the brain as the trigeminal nerve, facial nerve, and vestibulocochlear nerve exit the brain at this level. Conclusionįrom our study, we can conclude that the presence of AICA vascular loop either on CP angle or within IAC in tinnitus patients is an incidental finding and has no role in its etiology.Ĭerebellopontine fissure is made when the cerebellum folds over pons, creating a sharp angle between the two called as cerebellopontine angle. Out of 26 patients with left-sided tinnitus, 12 patients had AICA on same side, while 14 patients had AICA on the opposite (right) side, these findings being statistically insignificant ( p = 0.153). Out of 16 patients with right sided tinnitus, 11 patients had AICA on same side, while 5 patients had AICA on the opposite (left) side. Out of 131 unexplained tinnitus cases, 76 patients (58%) had AICA loop on MRI. All subjects were subjected to contrast enhanced MRI brain (3D fast spin echo T2W1 with drive equilibrium pulse) for evaluation of AICA using Chavda classification-type 1 (lying in CP angle, but not entering IAC), type 2 (entering IAC but extending 50% of length of IAC). The present prospective study was conducted in the Department of ENT, SMGS Hospital, GMC Jammu, from October 2020 to March 2022 on 131 subjects with unexplained tinnitus. In this study, we aim to evaluate whether there is any association of AICA vascular loops with unexplained tinnitus. Where there is no identifiable cause of otologic symptoms like hearing loss and tinnitus, it is believed that etiology could possibly involve a vascular loop in AICA compressing the vestibulo-cochlear nerve within the internal auditory canal.
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