Fig. 4.

Postoperative courses of the recurrent chronic subdural hematoma. Recurrence without resolution is defined as increased volume of the hematoma without resolution (4). Early recurrence after resolution is defined as recurrence of the resolved hematoma within 3 months after surgery (5). Late recurrence after resolution is defined as recurrence of the resolved hematoma after 3 months or more (6). Finally, the recurrent-and-resolved type, which is the spontaneously resolved recurrent CSDH (7).