Agenesis of the sacrum and coccyx.
D000015:Abnormalities, Multiple; D003050:Coccyx / Q000002:abnormalities*; D006801:Humans; D009421:Nervous System Malformations; D012445:Sacrococcygeal Region / Q000002:abnormalities*; D012447:Sacrum / Q000002:abnormalities*; D013118:Spinal Cord Diseases; D013577:Syndrome
COCCYX/abnormalities; SACROCOCCYGEAL REGION/abnormalities; SACRUM/abnormalities