OBJECTIVES: The purpose of this study was to inspect the clinical characteristics, surgical approaches, functional preservation, and complications of petrous bone @entity3540 and to propose appropriate surgical approaches based on long-term follow-up cases and previous reports in the literature. METHODS: The medical records of 31 @entity1 who underwent surgery for petrous bone @entity3540 between 1990 and 2011 at two tertiary referral hospitals were retrospectively analyzed with regard to the classification, type of surgical approach, preservation of @entity2167 , and recurrence. RESULTS: Of 31 cases, 16 were supralabyrinthine (class I), 1 was infralabyrinthine-apical (class III), 13 were massive (class IV), and 1 was apical (class V). @entity2103 was found in 35.5% of the cases (11 cases). Hearing was preserved in 11 of 22 @entity1 who had better than a 50-dB hearing level of bone conduction pure tone average preoperatively. Preoperative hearing was preserved in only four of the @entity1 in class I (supralabyrinthine). Facial function was preserved or improved in 29 @entity1 (93.5%). CONCLUSION: Complete removal of @entity3540 of petrous bone can be achieved by choosing the appropriate approach based on location and extent. Facial function was preserved postoperatively in most reviewed cases. Auditory function could not be preserved postoperatively in some cases, but preserving residual hearing levels can be accomplished mostly in supralabyrinthine @entity3540 with the appropriate surgical approach.

Hearing and facial function after surgical removal of XXXX involving petrous bone.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity3540 :: ('MESH:D002781', 'Disease') :: ['cholesteatomas', 'cholesteatoma'] @entity2103 :: ('MESH:D005155', 'Disease') :: ['Facial nerve palsy'] @entity2167 :: ('MESH:D006311', 'Disease') :: ['facial and auditory function']
@entity3540 :: (MESH:D002781,Disease) :: ['cholesteatomas']
