A radical mastoidectomy differs from a modified radical mastoidectomy by which additional step?

• A Removal of the posterior canal wall
• B Removal of the stapes footplate
• C Removal of the tympanic membrane remnant, malleus and incus ✓
• D Blind sac closure of the external auditory canal

Explanation

Both operations exteriorize the mastoid air cells into a single cavity by removing the posterior canal wall. The modified radical procedure preserves the tympanic membrane remnant and the intact ossicles to maintain sound transmission, whereas a radical mastoidectomy converts the middle ear, attic and antrum into one cavity by removing the drum remnant, malleus and incus. The stapes and its footplate are deliberately left undisturbed in both operations.

Reference: Dhingra's Diseases of Ear, Nose and Throat, 8th ed.

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Written and medically reviewed by the StethoPrep medical team.