During cortical mastoidectomy for acute mastoiditis, the surgeon identifies the solid angle (trautmann's triangle). The boundaries of the posterior fossa dural plate (Trautmann's triangle) in mastoidectomy are all EXCEPT:

• A Sigmoid sinus laterally
• B Superior petrosal sinus superiorly
• C Posterior semicircular canal posteriorly ✓
• D Jugular bulb inferiorly

Explanation

Trautmann's triangle is bounded by the sigmoid sinus posterolaterally, the superior petrosal sinus superiorly, and the posterior semicircular canal anteriorly — not posteriorly. The posterior semicircular canal forms the anterior boundary, not the posterior. The jugular bulb lies inferiorly. This triangle is important because it overlies the posterior fossa dura.

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

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Written and medically reviewed by the StethoPrep medical team.