A Unified Classification of Middle Ear and Petrous Bone Congenital Cholesteatomas.

Background: The aim of this study was to classify congenital cholesteatoma along an entire spectrum of involvement ranging from the middle ear to petrous apex.

Methods: A total of 131 patients (85 adults and 46 children) underwent operations for congenital cholesteatoma over the duration of 27 years.

Results: For most cases, middle ear mucosa was normal, the first ossicle eroded by the mass was the stapes, and the mastoid air cell system was well-pneumatized on intraoperative and radiographic views. Totally 34% of patients presented with facial nerve weakness and 45% of these cholesteatomas arose from the supralabyrinthine area (32.8%) and from the petrous apex (12.2%).

Conclusion: In this unified classification system, the otologist sees congenital cholesteatoma as a continuum, with facial nerve involvement and anacusis as part of the picture. This system of congenital cholesteatoma accommodates the supralabyrinthine and petrous bone locations of the disease.