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.