Postmortem Cerebrospinal Fluid Pleocytosis.Platt, Marvin S. M.D.; McClure, Stephen M.D.; Clarke, Raymond M.D.; Spitz, Werner U. M.D.; Cox, William M.D.American Journal of Forensic Medicine & Pathology: September 1989 Original Articles: PDF Only Abstract We show that postmortem cerebrospinal fluid (CSF) pleocytosis is a common event. Postmortem cerebrospinal or ventricular fluid was obtained from children and adults. The cells were counted and morphologically characterized using several histochemical markers. Infants exhibit a brisk postmortem CSF pleocytosis. Sudden infant death cases have relatively high CSF counts. Typeable cells are mononuclear and consist of ~60%-70% lymphocytes and 20%-40% macrophages. When postmortem duration is >12 h, the cells become vacuolated and cannot be identified. The etiology of these findings requires further study (C) Lippincott-Raven Publishers.