<unk>  is a condition where the sacrum (the fused vertebrae forming the back of the pelvis) is not formed properly, there is a mass in the presacral space in front of sacrum, and there are malformations of the anus or rectum.
The condition is an autosomal dominant genetic trait caused by a mutation in the HLXB9 homeobox gene.<unk>  may cause an anterior meningocele or presacral teratoma, or both.
Currarino syndrome
Braun-Bayer syndrome
Avellis syndrome
Charles Bonnet syndrome
De Grouchy Syndrome
Bearn-Kunkel syndrome
Mungan syndrome
Aagenaes syndrome