Central nervous system manifestations of chickenpox.

A study of 57 cases of affection of the central nervous system associated with chickenpox diagnosed and treated at The Hospital for Sick Children in Toronto between 1956 and 1967, inclusive, is presented. The commonest type, the cerebellar variety (50%), had an excellent prognosis. In the next commonest, the cerebral type (40%), the mortality rate was 35% but there was a low incidence of permanent sequelae in the surviving patients. A small group classed as aseptic meningitis was defined and one case of myelitis was reviewed.