Anaerobic meningitis secondary to a rectothecal fistula arising from an anterior sacral meningocele: report of a case and review of the literature.

An anterior sacral meningocele is a diverticulum of the thecal sac protruding anteriorly from the sacral spinal canal into the extraperitoneal presacral space. It is a rare congenital anomaly comprising of a thin wall of fibrous connective tissue, and containing cerebrospinal fluid and, occasionally, adjacent nerve fibers. We report an unusual case of a 48-year-old male who presented with meningitis secondary to a rectothecal fistula arising from an anterior sacral meningocele.