A case of acute subdural hematoma associated with arachnoid cyst by sport-related head injury

Abstract

It is reported that arachnoid cyst (AC) is ruptured due to head injury. There are also several reports on acute subdural hematoma (ASDH) with AC by sport-related head injury. However, their relationship is not clear. We present a case of ASDH associated with AC by sport-related head injury.

A 16-year-old-male suffered head injury in rugby game, and he had a headache. It was pointed that he had AC in right middle cranial fossa and posterior cranial fossa by previous CT scan. Initial CT showed the volume loss AC. The density of AC was changed to slightly higher. A subdural space of middle fossa and inter-hemispheric fissure was larger. The MRI showed that AC was continued to subdural space. So, we diagnosed that ASDH associated with ruptured AC by head injury.

We found two major points. 1; There is a possibility of ASDH with ruptured AC by contact sports. 2; Previous CT is very important in diagnosis about this case. A medical check before contact sports is useful and recommended to compare radiological changes pre and post head injury. Especially, MRI is convenient to a prolonged case and return-to-play.