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4.8.1 Probable nummular headache

Diagnostic criteria:

1. Continuous or intermittent head pain fulfilling criterion B
2. Felt exclusively in an area of the scalp, with three only of the following four characteristics:
   1. sharply-contoured
   2. fixed in size and shape
   3. round or elliptical
   4. 1-6 cm in diameter
3. Not fulfilling ICHD-3 criteria for any other headache disorder
4. Not better accounted for by another ICHD-3 diagnosis.