MacEwen triangle

The MacEwen triangle (also called the suprameatal triangle or mastoid fossa) is a small triangular depression affecting the inner table of the temporal bone.

The lines forming the triangle are:

History and etymology

It is named after Sir William MacEwen (1864-1924), Scottish surgeon.

Related pathology

The cortical bone is particularly thin making a preferred route of subperiosteal abscess (mastoid) formation, secondary to coalescent mastoiditis.

The mastoid antrum lies 1 cm deep to the triangle in the adult and is used when performing a cortical mastoidectomy.

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