LORAZEPAM FOR THE MANAGEMENT OF POSTERIOR FOSSA MUTISM: A CASE REPORT Posterior Fossa Syndrome (PFS) is a condition that can develop in children and adults following a cerebellar tumor resection surgery. The syndrome is characterized by multiple symptoms, including mutism, personality changes, and mobility problems. We present a case of a four-year-old boy diagnosed with posterior fossa tumor with secondary hydrocephalus who underwent an uneventful total resection of the tumor and developed posterior fossa syndrome, including mutism, was managed using lorazepam and made a full recovery of almost all of the symptoms he developed. Posterior fossa syndrome has multiple symptoms, most of which are usually transient. The exact pathophysiology and time to recovery are still not fully known. Patients with posterior fossa syndrome are managed with a multidisciplinary approach. Mutism resulting from this syndrome is proven to be successfully managed by lorazepam. ASEAN Journal of Psychiatry, Vol. 25 (5) May, 2024; 1-5.