The formation of an anterior sacral envelope hernia is associated with non-incompaction of the vertebral bodies. The hernia is filled with cerebral fluid and usually protrudes through a ventral defect in the sacrum. The diagnosis of a ventral-sacral hernia is very difficult. It does not cause changes in the neurological status and is more often diagnosed as a presacral dermoid cyst. The only complaint of patients is chronic constipation.
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