Indications for Diagnostic Labyrinthotomy: In Acoustic Neurinoma Suspects

Abstract

Diagnostic labyrinthotomy is indicated in acoustic neurinoma suspects: (1) when there is a progressive unilateral sensorineural loss and the laminograms of the internal auditory canals show no abnormalities; (2) when the posterior fossa contrast study is equivocal or unsatisfactory; (3) when there is a question of whether the filling defect represents an intracanicular or extra-canicular tumor; (4) to confirm the diagnosis of acoustic tumor following iophendylate study of the posterior fossa; (5) when the patient is allergic to contrast media; and (6) when there is no serviceable hearing in the affected ear.