The HRCT diagnosis of otosclerosis

WU Honglian; GAO Xianfang; LIANG Changhu; GONG Wuxian

Abstract：Objective To retrospectively analyse the HRCT features of the otosclerosis and to evaluate the sensitivity of HRCT to the diagnosis of otosclerosis .Methods The CT data of 53 patients with otosclerosis were collected .Standard axial , coronal and the image showing all structures of stapes were reformed using MPR technique .The images of 53 patients were evaluated by three neuroradiological doctors .Imaging findings of every patient were analyzed and HRCT detection sensitivity of otosclerosis was evaluated .Results CT confirmed the diagnosis of otosclerosis in 86 ears of 53 patients ( 98 ears ) .Otosclerosis lesions were shown as lower density lesions , punctate strip or patch .The lesions located anterior of vestibular window in 64 ears, pericochlear in 8 ears and peri internal auditory canal in 7 ears.Multi-lesions were seen in 7 ears.Thickened footplates of stapes were seen in 48 ears.The diagnosis in 7 ears was suspicious on CT images , which only showed thickened anterior part of stapes footplate in 7 ears and slightly irregular thickened stapes forefoot near bottom side in 3 ears.No abnormal changes were found in 5 ears with oto-scelerosis on HRCT images .The HRCT sensitivity in diagnosis of otoscelerosis of this study was 94.9%.Conclusion The fea-tures in most patients with otosclerosis can be shown on HRCT images .The images with submillimeter and the application of MPR technology can improve the HRCT sensitivity in diagnosis of otosclerosis .