Last revised by Yuranga Weerakkody on 13 Sep 2022

The scutum (plural: scuta) is a sharp bony spur that is formed by the superior wall of the external auditory canal and the lateral wall of the tympanic cavity. It forms the lateral margin of Prussak space.

Related pathology

  • acquired cholesteatoma: it is usually the first bony structure to be eroded by the enlarging cholesteatoma 1

History and etymology

The name scutum derives from the Latin word for shield.

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Cases and figures

  • Figure 1: annotated CT
    Drag here to reorder.