When this happens the cerebrospinal fluid leaks out from the intracranial and intraspinal spaces decreasing the pressure within the skull drops and can lead to headaches nausea. The outlook depends on the specific malformations present in each individual. 24 Must Have Items To Pack In Your Hospital Bag Packing Hospital Bag Hospital Bag Baby Hospital Bag The complication rate was 21 8 with permanent surgical morbidity of 3 2 and surgical mortality of 1 3. Chiari malformation surgery death rate . The most common surgery to treat chiari malformation is posterior fossa decompression. Chiari type iii malformation patients have a very high mortality rate and patients often die in. The term incidence of arnold chiari malformation type 1 refers to the annual diagnosis rate or the number of new cases of arnold chiari malformation type 1 diagnosed each year. The results of your decompression surgery depend on the severity of the chiari malformation and the extent of any previous bra...