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ENT General 6dd6f3ed

All of the following form the boundary of MacEwen's triangle except:

A
Temporal line
B
Posterosuperior segment of bony external auditory canal
C
Promontory
D
Tangent drawn to the external auditory meatus
High-Yield Explanation
Mastoid antrum is marked externally on the surface by suprameatal (Mac Ewen's) triangle.

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