Mutism without any disorder of consciousness level and or cranial deficit following posterior fossa surgery is not common and there is no definitive aetiological hypothesis. Here we report a case of mutism in a 6-year- old patient after total removal of a posterior fossa medulloblastoma. Mutism was noted immediately after the operation and resolved after four months. The literature is reviewed and possib!e mechanisms of cerebellar mutism are discussed.