system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
All are false about McEwen's triangle except:
assistant
The correct answer is  (a) Mastoid antrum lies 1.5cm deep to it(Ref. Shambaugh, 6th ed., page 32)It is a surgical landmark for the mastoid antrum, lying in the postauricular area. It is bounded superiorly by temporal line/supra mastoid crest which is the posterior extension of suprameatal crest.The suprameatal crest is the superior root of the zygomatic process.