Acute subdural hematoma (ASDH) of the posterior fossa is very rare in childhood. It represent 0.52% of all subdural hematomas. We report a case of post-traumatic acute subdural hematoma of the posterior fossa in a 4-year-old child who was drowsy, without a neurologic defect. The CT scan revealed a simple ASDH, with a good recovery after surgical treatment. The literature is reviewed, clinical and therapeutic aspects are discussed.