<unk> <unk> , also called mermaid syndrome, is a rare congenital deformity in which the legs are fused together, giving the appearance of a mermaid's tail, hence the nickname.
Sirenomelia
Rhizomelia
Mesomelia
Dolichostenomelia
Phocomelia
Meromelia
Loxoscelism
Adiposogenital dystrophy