![]() Pneumo-CT is an effective means of diagnosing vascular loops and differentiating them from other lesions of the cerebellopontine angle. Main outcome measures: Vascular loops with the cerebellopontine angle have been reported to approach the facial and cochleovestibular nerves at the level of the. neurovascular compression of vestibulocochlear nerve could be considered as a possible cause of. Eighth nerve tumors and vascular loops produce similar symptoms, but a cochlear type of hearing loss with good speech discrimination and normal caloric testing should raise suspicion of a vascular loop. ing loss and AICA loops in the IAC,3) Shelton et al. The wide range of audiometric and vestibular system test results probably reflects the complex interaction between the vascular loop and eighth cranial nerve, in which the loop exerts pressure on the nerve, and the nerve compromises inner ear circulation. Only one-third of the patients had abnormal caloric tests, but spontaneous nystagmus was detected in all but one of the patients by photoelectric nystagmography. Main Outcome Measures: Vascular loops within the cerebellopontine angle have been reported to approach the facial and cochleovestibular nerves at the level of the porus acousticus or within the internal auditory canal in 65 of postmortem specimens. Hearing losses ranged from mild to profound, and most were of a cochlear type with excellent speech discrimination. All patients were tumor suspects before CT because of unilateral (or asymmetric) tinnitus or hearing loss. Sudden unilateral hearing loss and vascular loop in the internal auditory canal: Case report and review of literature. In this study, we report the results of a uniform battery of audiometric and vestibular system test results administered to fifteen patients with prominent vascular loops in the internal auditory canal diagnosed by pneumo-CT. Sometimes due to Its proximity, the facial nerve may be. Previous reports have described pathologic anatomy, surgical approaches, and results of treatment. It can also be accompanied by auditory symptoms such as hyperacusis, tinnitus, and even hearing loss. These vascular loops are suspected of causing hearing loss, tinnitus, and vertigo, and surgery has been advocated to separate the vascular loop from the eighth cranial nerve. Prominent loops of the anterior inferior cerebellar artery in the cerebellopontine angle are found frequently during anatomic studies of this region. ![]()
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