In a canal wall down (modified radical) mastoidectomy, what is the critical step that determines the adequacy of the meatoplasty?
- A Removal of all mastoid air cells including the tip
- B Complete removal of the tympanic membrane
- C Creating a meatoplasty large enough for adequate ventilation and cleaning of the mastoid bowl ✓
- D Preservation of the chorda tympani nerve at all costs
Correct answer: C. Creating a meatoplasty large enough for adequate ventilation and cleaning of the mastoid bowl
Explanation
In canal wall down mastoidectomy, a wide meatoplasty is critical to ensure adequate ventilation, drainage, and accessibility for aural toilet of the mastoid bowl. An inadequate meatoplasty leads to retention of epithelial debris, recurrent otorrhoea, and failure of the cavity. Wound breakdown and cavity problems are the most common causes of surgical failure. The tympanic membrane remnant may be used for reconstruction.
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.