Earticle

Background and Objectives：With advances in techniques in the field of otology, we can now offer better treatment to patients with the conductive hearing loss. Otosclerosis is rare in the mongoloids so the diagnosis and treatment modality are (HRCT) of patients with otsc-lerosis who were confirmed through explotympanotomy and found that there were specific radiological finding relevant to otsclerosis. The purpose of this study was to understand the HRCT findings of otosclerosis in order to provide more information about the disease. Materials and Methods：We selected 42 HRCT available patients of 126 patients who were operated in (scan thickness 1 mm, scan interval 1 mm) CT scanner. Results：There were radiolucent lesions in 48 ears (62% ). The lesi-ons were found in the fisula ante fenestram, cochlea, and the semicircular canal. Conclusions：HRCT could be used as an adjunctive diagnostic tool for the detection of otosclerotic lesion, stapedial or cochlear. We could find positive findings in 62% of the patients who showed progresive and conductive hearing loss. (Korean J Otolaryngol 2002;45:118-21)

Background and Objectives：Meningogenic labyrinthitis is a comon cause of acquired profound sensorineural hearing loss in childhod. Obliterated cochlea is one of the most challenging problems in cochlear implantation because it limits the insertion of active electrodes. The aims of this study were to review the surgical findings of meningitic deaf children and to (n＝20). Materials and Method：Of the 104 children who had implants, 18 (17.3%) were deafened by meningitis. Operative and high resolution CT (HRCT) findings were reviewed retrospectively with medical records. Speech feature discrimination test was performed to evaluate speech performance. Results：Seventeen out of 18 patients (94% ) required drilling of the ossified bones at sur-(71% sensitivity). Speech perception was tested for in ten cases. In 5 of the ten cases, complete insertion of electrodes was not possible. There were no significant diferences in speech feature discrimination betwen congenital deaf children and meningitic deaf children. Speech perception was not rel-ated to the number of the electrodes inserted. Conclusion：Most (94% ) of postmeningitic deaf children had ossification. When Postmeningitic deaf children with ossified cochlear could obtain comparable benefit from having implants as much as non-meningitic children. (Korean J Otolaryngol 2002;45:13-7)