Radiology of acute mastoiditis and its complications: a pictorial review and interpretation checklist.

BACKGROUND

Mastoiditis is an otological emergency, and cross-sectional imaging has a role in the diagnosis of complications and surgical planning. Advances in imaging technology are becoming increasingly sophisticated and, by the same token, the ability to accurately interpret findings is essential.

METHODS

This paper reviews common and rare complications of mastoiditis using case-led examples. A radiologist-derived systematic checklist is proposed, to assist the ENT surgeon with interpreting cross-sectional imaging in emergency mastoiditis cases when the opinion of a head and neck radiologist may be difficult to obtain.

RESULTS

A 16-point checklist (the 'mastoid 16') was used on a case-led basis to review the radiological features of both common and rare complications of mastoiditis; this is complemented with imaging examples.

CONCLUSION

Acute mastoiditis has a range of serious complications that may be amenable to treatment, once diagnosed using appropriate imaging. The proposed checklist provides a systematic approach to identifying complications of mastoiditis.