The Intrasacral Meningocele

Abstract

Meningeal diverticula arising as a protrusion of the arachnoid through a weak place in the dura are called sacral meningoceles. They occur in the sacral region and produce local vertebral erosions. Eleven cases of this rare and potentially progressive lesion were detected on 3250 CT examinations of the lumbosacral spine. The pathogenesis and clinical picture of the condition are reviewed. Intrasacral meningoceles are well displayed on CT and MRI scans, although the diagnosis may also be established at myelography. Such arachnoid cysts should be distinguished from lumbosacral dural anomalies observed in von Recklinghausen neurofibromatosis. Surgical excision should be carried out before irreversible nerve root changes occur.