![]() ![]() Bilateral IAC diverticula were observed in 20/28 (71%) with otosclerosis in contrast to 29/54 (54%) patients without otosclerosis. Twenty-eight (34%) of the 82 patients with either unilateral or bilateral IAC diverticula also had otosclerosis. Notably, 15/18 (83%) patients showed fluid signal when the slice thickness of the MR imaging was ≤1 mm, but only 7/23 (30%) showed fluid signal when the slice thickness was 3–5 mm. Of those patients, 22 (54%) had corresponding fluid signal within the presumed IAC diverticulum and 19 (46%) did not. The discrepancy between the two is attributable to the common scenario of incomplete medical histories provided in the indications for radiologic studies or provided indications that are associated with hearing loss without explicitly stating it.įorty-one of the 82 (50%) also had MR imaging of the diverticula available at the time of review. Review of each patient's electronic medical record revealed that 88% of the study population had a history of hearing impairment at the time the CT was performed. Indications provided for CT scans noted hearing impairment in 52% of cases. The median age for these 82 patients was 54 years, ranging from 1 to 91 years of age, and 57% ( n = 47) were men and 43% ( n = 35) women. Eighty-two of these patients (4.7%) had a focal lucency along the anteroinferior margin of the IAC fundus unilaterally ( n = 33, 40%) or bilaterally ( n = 49, 60%) on dedicated temporal bone CT scans. Secondarily, available MR images of the head in the 82 patients with CT findings of IAC diverticula were reviewed to assess for the presence of fluid signal within the diverticula.Ī total of 1759 patients were scanned during the nearly 6-year study interval. The indications for each study were also recorded, and the medical history was reviewed for the presence of clinical concern for hearing impairment at the time the CT scan was obtained. Measurement of the anteroposterior depth for each IAC diverticulum was recorded in addition to the presence of radiologic evidence of fenestral and retrofenestral otosclerosis. Each temporal bone CT scan in this cohort was obtained on CT scanners from the same manufacturer Siemens Definition and Siemens Flash (Siemens, Erlangen, Germany) with either 64– or 128–detector rows/slices. All patients with a focal lucency in the anteroinferior margin of the IAC fundus (IAC diverticulum) in one or both ears were collected into a database. A retrospective review of all temporal bone CTs obtained during a nearly 6-year period (June 9, 2009, to March 8, 2015) in patients with research-use approval was performed by a single radiologist with a Certificate of Added Qualification in neuroradiology and >20 years of clinical experience. ![]()
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