Our results demonstrate the fundamental role of the immunohistochemical technique for conclusive diagnosis of undifferentiated tumors.

Background. Electric-acoustic stimulation (EAS) is an excellent choice for people with residual hearing in low frequencies but not high frequencies and who derive insufficient benefit from hearing aids. For EAS to be effective, subjects' residual hearing must be preserved during cochlear implant (CI) surgery. Methods. We implanted 6 subjects with a CI. We used a special surgical technique and an electrode designed to be atraumatic. Subjects' rates of residual hearing preservation were measured 3 times postoperatively, lastly after at least a year of implant experience. Subjects' aided speech perception was tested pre- and postoperatively with a sentence test in quiet. Subjects' subjective responses assessed after a year of EAS or CI experience. Results. 4 subjects had total or partial residual hearing preservation; 2 subjects had total residual hearing loss. All subjects' hearing and speech perception benefited from cochlear implantation. CI diminished or eliminated tinnitus in all 4 subjects who had it preoperatively. 5 subjects reported great satisfaction with their new device. Conclusions. When we have more experience with our surgical technique we are confident we will be able to report increased rates of residual hearing preservation. Hopefully, our study will raise the profile of EAS in Brazil and Latin/South America.

The hearing preservation occurred in 89.4% of cases. There was no significant difference between the forms of inner ear approach.

The cost of cochlear implants has been one of the main impediments to bilateral rehabilitation. The Digisonic SP® Binaural Neurelec device addresses this issue and exposes patients to less risk through a minimally invasive implantation procedure.

The Digisonic® SP cochlear implant developed by Neurelec offered good audiological results for adult patients, shorter surgery time, and no surgical or postoperative complications.

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Introduction: Cochlear implantation (CI) is a worldwide procedure that provides hearing rehabilitation and improves speech perception. One of the described complications is the device migration, which can result of failure of receiver-stimulator (R/S) fixation. This study aims to describe the outcomes of cochlear implant receiver-stimulator (RS) placement (bone well and the subperiosteral temporal pocket technique without fixation). Methods: A retrospective case review is developed in tertiary care university hospital center that compares the bone well and the subperiosteral temporal pocket technique without fixation in two periods (at the end of the surgery and one year after CI surgery). Results: The age range from 22 to 64 years (average of 41.2 year-old). Follow-up time ranges from 12 to 51 months (average 24 months). The patients, divided into two groups (subperiostal pocket = 6 patients and bone well = 3 patients), are analyzed through major and minor complications. No intraoperative wounds or intracranial complications have been observed in either group. Device migration occurs in three patients of subperiostal pocket group (50%), but with no apparent clinical outcomes. The migration measure is about not more than 1 up to 2 centimeters antero-inferiorly by the radiography evaluation. Conclusion: Device migration is more frequent in the subperioteal pocket group (50%) with statistical significance (p < 0.05). However it is not identified, apparently, no clinical and aesthetic account related to this situation.