Macewen's 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:
- anterior: posterior border of the external acoustic meatus
- superior: posterior root of the zygomatic arch
- posterior: line joining the two
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.
Siehe auch:
und weiter:
Assoziationen und Differentialdiagnosen zu Macewen's triangle: