P T Dang1, T A Kennedy2, S P Gubbels3. 1. School of Medicine and Public Health, University of Wisconsin - Madison, USA. 2. Department of Radiology, Section of Neuroradiology, University of Wisconsin - Madison, USA. 3. Department of Surgery, Division of Otolaryngology and Waisman Center, University of Wisconsin - Madison, USA.
Abstract
OBJECTIVE: To describe a case of bilateral superior and posterior semicircular canal dehiscences, and the use of a unilateral transmastoid approach to address both right-sided defects simultaneously. CASE REPORT: In a patient with right-sided hyperacusis, bilateral dehiscence of both the superior and the posterior semicircular canals was identified, located adjacent to the common crus, together with a right-sided, anterosuperiorly positioned sigmoid sinus and a high-riding jugular bulb. Results for audiography and cervical vestibular evoked myogenic potential testing were consistent with right-sided semicircular canal dehiscence. At surgery, a right-sided transmastoid approach provided access to plug both defects simultaneously, following posterior mobilisation of the sigmoid sinus. The patient's hyperacusis was completely resolved, with a 10-30 dB improvement in his right ear air conduction hearing, without decrement in bone conduction. CONCLUSION: In properly selected patients, a transmastoid approach can be used to effectively manage superior semicircular canal dehiscence and posterior semicircular canal dehiscence simultaneously. Pre-operative computed tomography is recommended to evaluate the dehiscence sites and to identify complicating vascular anatomy.
OBJECTIVE: To describe a case of bilateral superior and posterior semicircular canal dehiscences, and the use of a unilateral transmastoid approach to address both right-sided defects simultaneously. CASE REPORT: In a patient with right-sided hyperacusis, bilateral dehiscence of both the superior and the posterior semicircular canals was identified, located adjacent to the common crus, together with a right-sided, anterosuperiorly positioned sigmoid sinus and a high-riding jugular bulb. Results for audiography and cervical vestibular evoked myogenic potential testing were consistent with right-sided semicircular canal dehiscence. At surgery, a right-sided transmastoid approach provided access to plug both defects simultaneously, following posterior mobilisation of the sigmoid sinus. The patient's hyperacusis was completely resolved, with a 10-30 dB improvement in his right ear air conduction hearing, without decrement in bone conduction. CONCLUSION: In properly selected patients, a transmastoid approach can be used to effectively manage superior semicircular canal dehiscence and posterior semicircular canal dehiscence simultaneously. Pre-operative computed tomography is recommended to evaluate the dehiscence sites and to identify complicating vascular anatomy.
Authors: G A Krombach; E DiMartino; T Schmitz-Rode; A Prescher; P Haage; S Kinzel; R W Günther Journal: Eur Radiol Date: 2003-02-15 Impact factor: 5.315
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Authors: Ektor Tsuneo Onishi; Cláudia Couto de Barros Coelho; Jeanne Oiticica; Ricardo Rodrigues Figueiredo; Rita de Cassia Cassou Guimarães; Tanit Ganz Sanchez; Adriana Lima Gürtler; Alessandra Ramos Venosa; André Luiz Lopes Sampaio; Andreia Aparecida Azevedo; Anna Paula Batista de Ávila Pires; Bruno Borges de Carvalho Barros; Carlos Augusto Costa Pires de Oliveira; Clarice Saba; Fernando Kaoru Yonamine; Ítalo Roberto Torres de Medeiros; Letícia Petersen Schmidt Rosito; Marcelo José Abras Rates; Márcia Akemi Kii; Mariana Lopes Fávero; Mônica Alcantara de Oliveira Santos; Osmar Clayton Person; Patrícia Ciminelli; Renata de Almeida Marcondes; Ronaldo Kennedy de Paula Moreira; Sandro de Menezes Santos Torres Journal: Braz J Otorhinolaryngol Date: 2017-12-24