During stapedectomy, the surgeon notes that the facial nerve is dehiscent in the tympanic segment, overhanging the oval window and obscuring the footplate. This anatomical variation occurs in approximately what percentage of the population?

• A 5 to 10 percent ✓
• B 20 to 25 percent
• C 35 to 40 percent
• D 50 to 55 percent

Explanation

Facial nerve dehiscence over the oval window occurs in approximately 5 to 10 percent of individuals and is a recognized anatomical variation that complicates stapedectomy. The surgeon must identify the nerve to avoid injury and may need to modify the surgical approach, such as performing a stapedotomy rather than full footplate removal.

Reference: Glasscock-Shambaugh Surgery of the Ear, 6th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.