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ENT · Otology: dangerous quadrant
Sample itemWhich quadrant of the tympanic membrane is called the dangerous area for incision?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
B. Posterosuperior
Behind the posterosuperior quadrant lie the incudostapedial joint, the stapes, the chorda tympani and the facial nerve. An incision here can dislocate ossicles or injure the nerve. Most myringotomies are placed inferiorly.
Option by option
A. Posteroinferior
The posteroinferior quadrant is a recognised safe site for myringotomy.
B. Posterosuperior (correct)
Correct. The posterosuperior quadrant overlies critical structures.
C. Anteroinferior
The anteroinferior quadrant is a safe site for ventilation tubes.
D. Anterosuperior
The anterosuperior quadrant is not considered the dangerous quadrant.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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