PRE-OPERATIVE ASSESSMENT OF THE SINUS TYMPANI BY C. T. SCANNING
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A pathological process in the middle ear may extend to the sinus tympani In case the sinus tympani is having deep extension complete eradication with any of available surgical approaches is doubtful and there is a high incidence of recurrent pathology. The retrofacial approach can completely expose the sinus tympani. However, it has same limitation due to the close proximity of the facial nerve and posterior semicircular canal to the sinus tympani and possible encroachment by the jugular bulb. The value of high resolution C.T. scanning in evaluating the anatomical situation of the sinus tympani is the aim of this study. Size measurements and relations to neighboring structures were ItO difference when comparirug results obtained from C.T. imaging and anatomical dissection. Accordingly, the authors suggest that preoperative imaging can select patients who are candidates for retrofacial approach to expose and remove pathology in the sinus tympani.