![]() ![]() Three patients with disabling tinnitus resulting from a loop in the internal auditory canal were evaluated with magnetic resonance imaging and tests of pure tone auditory, tinnitus, and auditory brain response (ABR) to identify the features of the cochlear nerve. Although the role of surgical decompression remains unclear, it appears that patients presenting with vertigo have more favorable response to surgical decompression as compared with those presenting with tinnitus and sensorineural hearing loss. Microsurgical decompression via endoscope-assisted retrosigmoid approach is a. Results Of the 13 patients who underwent surgical decompression, 8 patients had resolution of vertigo symptoms, 10 patients had improvement of tinnitus symptoms, and all patients maintained some level of serviceable hearing.Ĭonclusion IAC exostoses and osteomas are rare lesions that lead to insidious onset of debilitating symptoms from vestibulocochlear nerve dysfunction. A total of 26 reported cases were identified, and patient presenting symptoms, management strategies, and response to surgery was obtained when available. SEMICIRCULAR CANAL 808.00 DECOMPRESSION INTERNAL AUDITORY CANAL 1599.00. Methods A comprehensive search was conducted using PubMed Central, Web of Science Core Collection, and Google Scholar databases to identify previous reports of IAC exostoses and osteomas. INTERNAL AUDITORY MEATUS, exploration by middle cranial fossa approach with cranial nerve decompression. 1006.00 ( INCLUDING CANALPLASTY, ATTICOTOMY AND / OR MIDDLE EAR SURGERY ). ![]() SDSs improved from 85 20-100 to 92. Apfelbaum RI (1977) A comparison of gerrutaneous radiofrequency trigeminal neurolysis and microvascular decompression of the trigeminal nerve for. We present two cases of IAC exostoses managed with surgical decompression and review the clinical outcomes of previously reported cases in the literature. In the hearing maintenance group, the SDSs remained stable. Thus, the size measurements of the IAC and nerves in the image were estimated using the number of the counted pixels and the voxel information retrieved from the DICOM information of the given MR image.Background Exostoses and osteomas are benign, insidious lesions of the bone involving the internal acoustic canal (IAC). After the interactive selection of a particular object, the IAC was denoted by a radiologist, and the pixels of the object in the image were counted to calculate the area of the selected IAC. The gray level image was converted to a binary image to expose the object in the image by calculating a threshold using Otsu's method. The purpose of this review is to provide an overview of the most useful MRI sequences for internal auditory canal and labyrinthine imaging, review the relevant anatomy, and discuss the expected appearances of the most commonly encountered pathologic entities. The improved image of the ROI image in Fig. Intraoperatively, no obvious cystic lesion was identified. In order to improve the image quality of an ROI image, a resizing procedure was implemented using an interpolation kernel, particularly a Lanczos-2 kernel. The patient was subsequently taken to the operating room for facial-nerve decompression. The author first described the technique for total decompression of the facial nerve in 19665 and first described the retrolabyrinthineapproach tothe cerebello-pontineangle in 1971. Since the ROI images had a low resolution (about 25×25 pixels), a resolution improvement was required for a suitable examination. internal auditory canal and House' perfected the translabyrinthine approach in 1963. The region of interest (ROI) in the images including the IAC was extracted by a radiologist manually. A sample of the image used in this study is shown in Fig. The patient's symptoms resolved immediately after surgery, and no symptoms were noted during 2 years of follow-up in our clinic. The AICA loop was mobilized and separated from the vestibulocochlear nerve. Obtained image was converted into a 512×512 raw gray level image by removing the Digital Imaging and Communications in Medicine (DICOM) header information. The large AICA loop was found extending into the internal auditory canal and compressing the vestibulocochlear nerve. Selected standard images at the level of posterior and superior semi-circular canals confluens (V shape appearance) were used for image analysis. ![]()
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