Anterior sacral meningocele presenting as a pelvic mass and diagnosed only at celiotomy after an extensive workup. A case report.

A marfanoid patient underwent celiotomy for a pelvic mass and was found to have an anterior sacral meningocele. Nine years prior to that time she had undergone surgery because of a "sacrococcygeal cyst," which in retrospect seemed to be a posterior meningocele. The preoperative diagnosis of meningocele is important to successful treatment.