Congenital absence of the sacrum and coccyx.
D000015:Abnormalities, Multiple; D003050:Coccyx / Q000002:abnormalities*; D006801:Humans; D009141:Musculoskeletal System; D012447:Sacrum / Q000002:abnormalities*; D013118:Spinal Cord Diseases
COCCYX/abnormalities; SACRUM/abnormalities