Acute subdural hematoma due to minor head trauma in patients with a lumboperitoneal shunt.

The cases of four patients treated with a lumboperitoneal shunt in whom acute subdural hematoma occurred after minor head trauma are presented. Three of the four patients had subdural fluid collection or widening of subarachnoid space observed on computed tomography scan after placement of the lumboperitoneal shunt. We report that patients with a lumboperitoneal shunt have the potential to develop acute subdural hematoma due to minor head trauma, and discuss its mechanism.