A rare patient who had rapid spontaneous resolution of an acute subdural hematoma caused by boxing is reported. On admission a CT scan showed a subdural hematoma containing a low-density area over the left cerebral hemisphere. The subdural hematoma had disappeared on a CT scan taken 1 day after the injury. But magnetic resonance imaging showed that the subdural hematoma was not completely resolved. The hematoma was detected diffusely covering the cerebral convexities and the left side of the tentorium. The outcome was good with nonsurgical treatment. We present this case and discuss the mechanisms of rapid resolution of acute subdural hematoma.
