Abstract
The progress of the recent imaging technology is remarkable, and the presence or absence of the lesions and the extent of disease progression in the patients with otosclerosis can be accurately evaluated by high-resolution CT scanning. We reviewed preoperative CT findings and postoperative outcomes in patients who underwent surgery for otosclerosis. Clinical data were obtained in 81 ears from 67 patients (29 men, 38 women) who underwent initial stapes surgery examined by CT scanning of the temporal bone and the various examinations. The presence or absence of decalcification in the anterior oval window and pericochlear regions was determined from preoperative CT images. Postoperative outcomes were assessed using the criteria proposed by the American Academy of Otolaryngology-Head and Neck Surgery (AAO-HNS). The postoperative pure tone average (PTA) was within 10 dB were considered to have improved hearing acuity. Based on CT scans findings, there were 48 ears (59.3%) diagnosed as fenestral type, 8 ears (9.9%) as retrofenestral type with decalcification involving the cochlea, and 25 ears (30.9%) as none of positive findings. Eight ears (9.9%) showed the narrowing of the oval window and 18 ears (22.2%) thickening of the footplate of the stapes. As the surgical results, the operation was successful in 64 (79.0%) of the 81 ears. The surgical treatment was successful in 3 of the 7 ears with oval window narrowing and in 12 of the 18 ears with footplate thickening on CT scans. The surgical success rate was low in the patients with CT-confirmed oval window narrowing or stapedial footplate thickening.
