The cerebellum is known to be responsible for posture and motor coordination of the body. Recent studies indicate that the cerebellum has a role in conduction of higher brain functions, such as perception, affect, capacity to analyze, and memory, via neuronal connections between the cerebellum and the other regions of the brain. Schmahmann and Shermann described a new syndrome called "the Cerebellar Cognitive Affective Syndrome" (SCAS) and drew attention on cognitive functions of cerebellum. The syndrome was described in a group of patients who had impairment of executive functions, difficulties with spatial cognition, personality changes, blunt affect and language deficits in addition to primary neurological symptoms. In this case report we present a rare case of cerebellar cognitive affective syndrome presenting with pure psychiatric symptoms,who had a posterior cerebellar lobe lesion due to a contusion at the back of the skull.