<unk>  is an inherited congenital disorder where either the sacrum (the fused vertebrae forming the back of the pelvis) is not formed properly, or there is a mass in the presacral space in front of the sacrum, and there are malformations of the anus or rectum. It occurs in approximately 1 in 100,000 people. Anterior sacral meningocele is the most common presacral mass in patients with<unk> , occurring in 60% of cases. Its presence may significantly affect the surgical management of these patients. Other potential presacral masses include presacral teratoma and enteric cyst. Presacral teratoma usually is considered to be a variant of sacrococcygeal teratoma. However, the presacral teratoma that is characteristic of the<unk>  may be a distinct kind.
Currarino syndrome
DeSanto-Shinawi syndrome
Pelger–Huët anomaly
Baggio–Yoshinari syndrome
Nakajo syndrome
Cantú syndrome
Fechtner syndrome
Bruck syndrome