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POSTERSsometimes be identified on examination, but CT is highly sensitive in confirming the diagnosis. Most patients require a canal wall down procedure but the canal wall can be reconstructed in select cases. Otology/NeurotologyLong-term Surgical Results of Semicircular Canal Fistulae Hirokazu Katsura, MD (presenter); Yasuo Mishiro; Osamu Adachi; Masafumi SakagamiObjective: Although many studies report short-term hearing results after surgically managing semicircular canal fistulae, long-term results are still unknown. In the present study, longterm postoperative hearing outcomes were reviewed in 14 ears of patients with cholesteatoma and semicircular canal fistulae.Method: Between 1996 and 2010, 84 patients with cholesteatoma and semicircular canal fistulae underwent tympanoplasty at Hyogo College of Medicine Hospital. The location of the fistula was the lateral semicircular canal in all cases and superior semicircular canal in 5 cases. Fourteen patients were followed up for more than 5 years.Results: Postoperative air-bone gap was ≤10 dB in 1 case, between 11 and 20 dB in 7 cases, between 21 and 30 dB in 4 cases, and ≥31 dB in 2 cases. Mean bone-conduction hearing levels on the operated side had deteriorated by 3 dB in 1 kHz, by -1 dB in 2 kHz, and -2 dB in 4 kHz at 1 year postoperatively and by 8 dB, 6 dB, and 2 dB at 5 years postoperatively, respectively. Bone-conduction hearing levels in 1 and 2 kHz were significantly deteriorated at 5 years postoperatively, compared with baseline and 1-year (P < .05).Conclusion: Even if the semicircular canal fistula is surgically managed, bone-conduction hearing level gradually deteriorates in the 1-and 2-kHz ranges over the long time.

We retrospectively evaluated 26 patients with bilateral progressive HL who visited our hospital from 2007 to 2011. We excluded the patients with bilateral Ménière'ss disease and acute low-tone SNHL from our study. Results: We diagnosed 5 cases with immune-mediated inner ear disease (IMIED) such as vasculitis, 5 with functional HL, 4 with intracranial diseases including nonbacterial meningitis, lymphoma, and siderosis, and 1 with drug-induced HL. We could not identify causes in the remaining 11 cases. HL was one of the first symptoms in 10 of 11 cases with IMIED and intracranial diseases. Treatments including steroid administration achieved significant hearing recovery in 4 cases, including 3 with IMIED and 1 with lymphoma. Conclusion: We revealed that the bilateral progressive HL was often the first symptom of systemic or intracranial diseases. Screening for systemic and intracranial diseases is, thus, important for adequate treatment at early stage of disease.

and 22 PORP tymapanoplasty (PORPT) cases were studied. Age and sex distribution, success rate of hearing improvement, mean of postoperative air-bone gap, and rate of middle ear adhesion were analysed according to the type of surgery. RESULTS: At three months after surgery, success rates of hearing improvement were 37.0%, 51.4%, and 57.1% for CT-TIII, SCT, and PORPT, respectively. Means of postoperative ABG in the above listed order were 25.1dB, 19.4dB, and 17.2dB, respectively. Hearing results were statistically better in POPRT when compared with other groups. At one year after surgery, success rates of hearing improvement were 21.1%, 35.5%, and 64.7% in CTTIII, SCT, and PORPT, respectively. Means of postoperative ABG in the above listed order were 29.1%, 20.3dB, and 16.7dB, respectively. Hearing results were statistically better in PORPT compared with other groups. Rates of middle ear adhesion were 23.1%, 54.5% in CTTIII, tympanoplasty using strut, respectively. CONCLUSIONS: In cases with intact stapes in CWD tympanoplasty, it was concluded that tympanoplasty using strut is more useful for hearing improvement and prevention of middle ear adhesion than classical tympanoplasty type III; for the strut material, PORP was more effective than autologous materials.

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