In a modified radical mastoidectomy, which structure must be preserved to allow open cavity to drain freely and is also called the 'meatoplasty' target?

• A External auditory canal posterior wall
• B Eustachian tube orifice
• C Annular ligament
• D Widened bony meatus to facilitate cavity aeration ✓

Explanation

In modified radical mastoidectomy, a meatoplasty is performed to create a wide bony meatal opening so the open mastoid cavity is ventilated and can be inspected. The posterior canal wall is taken down (unlike canal wall-up), creating a common cavity between mastoid and meatus. The Eustachian tube is obliterated or plugged to prevent reflux. The annular ligament and annulus are preserved when the middle ear is retained in a modified (as opposed to radical) procedure.

Reference: Dhingra Diseases of Ear, Nose and Throat, 7th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.