cerebellomedullary malformation syndromenoun [ U ]
uk/ser.ɪˌbel.əʊ.medˌʌl.ər.i mæl.fɔːˈmeɪ.ʃən ˌsɪn.drəʊm/us/ˌser.əˌbel.oʊ.meˈdʌl.ər.i ˌmæl.fɔːrˈmeɪ.ʃən ˌsɪn.droʊm/also Arnold-Chiari syndrome specializeda physical problem present from birth in which part of the brain is pushed through the opening for the spinal cord at the base of the skull, blocking the flow of fluid into the brain and spinal cord