[Cholesteatoma of Bichat's fissure. Observations apropos of a case].

Four reasons are evoked for presenting a case of cholesteatoma of Bichat's fissure: --its symptomatology, specific to the site of the lesion, and previously demonstrated by Gros and Vlahovitch; --its appearance on computed tomography, still relatively unknown because of the rare nature of these lesions; --the open discussions still being conducted as to the "parasellar" qualification adopted by J. Lepoire and B. Pertuiset for this localization; --and the debated question as to the best surgical approach.