11/21/2023 0 Comments Acoustic meatusOf the 64 ears evaluated, 28 (43.75%) presented no vascular loop, 31 (48.44%) Two of those were excluded for presenting differentĬlassifications among the three evaluators. If at least two of the three evaluators were in agreement. Separated the data by sidedness and considered the Chavda classification concordant To evaluate interobserver agreement regarding the grading of the vascular loops, we Occupies more than 50% of the canal of the internal auditory meatus, The kappa test was used in order to characterize the concordanceīetween the examiners as to the type of vascular loop identified.Įxamples of Chavda grade III vascular loops in the AICA. We used the chi-square test to determine whether the presence of a vascular loop wasĪssociated with tinnitus, hearing loss, or dizziness The level of significanceĪdopted was 0.05. Less of the canal or grade III - when the loop occupies more than 50% of the The loop insinuates itself into the internal auditory meatus but occupies 50% or Loop borders the internal auditory meatus (internal acoustic pore) grade II - when The Chavda classification grades the vascular loops in the AICA as follows ( 8): grade I - when an AICA vascular Graded the vascular loops according to the Chavda classification ( 8). Three radiologists, each with more than five years of experience, T MRI scanners (Gyroscan-NT and Intera, respectively Philips, Best, the Subarachnoid space and the cranial nerves. Technique, which increases the contrast between the cerebrospinal fluid in the Through a T2-weighted sequence, using the three-dimensional driven equilibrium We evaluated the trajectory of the AICA in relation to the internal auditory meatus These patients completed a questionnaire and gave We selected 33 adults with otologic complaints who underwent MRI at our facilityīetween June and November of 2013. Resonance imaging (MRI), the presence of vascular loops and their association with The objective of the present study was to evaluate and analyze, through magnetic Numerous articles have focused on this condition, the existence of vascularĬompression syndromes continues to be questioned. With the vestibulocochlear nerve (eighth cranial nerve), resulting in otologic Jannetta et al., for example, suggested that redundant arterial loops could interfere Since been expanded to explain diseases related to various cranial nerves. Vertebral artery aneurysm was found to be compressing the facial nerve of a Prototype of this syndrome, hemifacial spasm, was first described in 1875, when a McKenzie in 1936 and popularized by Jannetta in 1975 ( 4, 6). The term vascular compression syndrome, which refers to a group of diseases caused byĭirect contact between a blood vessel and a cranial nerve, was introduced by Vascular loop in the anterior inferior cerebellar artery (AICA), insinuating itself In some cases, it is believed that the etiology involves a Symptoms in the Brazilian population is approximately 22% for tinnitus ( 1), 9% for hearing loss ( 2), and 42% for dizziness ( 3), and those rates increase withĪlthough various diseases are associated with otologic symptoms, the cause is notĪlways identified. Common otologic symptoms include tinnitus (the perception of sounds in the absence ofĮxternal stimuli), hearing loss, and dizziness.
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