MRIs were performed with and without gadolinium, using a Philips Gyroscan Achieva (Philips Achieva‐XR, Netherlands 2010) by using 3D‐DRIVE and 2D‐T2WI sequences. All MRIs of IACs acquired from 1247 sequential studies from November 2019 to October 2020 were analyzed. This project was conducted in a tertiary referral University hospital. We analyzed size and location of cysts, the radiological features and patterns of cranial nerve displacement, and presence of nerve compression.Īll study procedures were performed in strict accordance with institutional research board (ID: 0027032019), and Helsinki declaration. We hypothesized that site‐specific neural compression of cochlear or vestibular nerves in the IAC would correlate with clinical symptoms. MPR findings have previously been correlated with auditory and vestibular symptomsĪnd discriminate benign nerve displacement from compressive nerve injury for surgical planning. We previously reported on this approach, demonstrating utility of MPR for characterizing vascular loops features (e.g., position, contact with nerve, and vessel caliber). MPR is particularly useful for delineating compressive phenomena, such as mass effects exerted on adjacent neural structures. Multiplanar reconstruction (MPR) may increase spatial resolution. Radiological assessment of AC is challenging due to the thin arachnoid membrane and the small, complex anatomy of the IAC. Gadolinium‐based contrast agents facilitate differentiation of AC from tumorsĪlthough gadolinium may induce allergic reactions in predisposed individuals. Similar to cystic variants of schwannoma.ĭiagnosis most commonly follows abnormal auditory or vestibular testingĪnd magnetic resonance imaging (MRI) with IAC protocol. Literature investigating AC of the IAC is scarce, but available data have suggested associations with sensorineural hearing loss (SNHL), Arachnoid cysts (AC) are cerebrospinal fluid‐filled sacs, covered by a membrane of arachnoidal cells that are thought to arise from a congenital split of the arachnoid layer or trauma.ĪC have received surprisingly little attention in otolaryngology-head and neck surgery yet, they represent the most common type of brain cyst, and approximately 11% of AC occur in the cerebellopontine angle.Īlthough many AC are asymptomatic, cysts that occur within bony confines, such as the internal auditory canal (IAC) may have increased risk of compressive symptoms.
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