| Sirenomelia | |
|---|---|
 | |
| Sirenomelia, Lyon natural history and anatomy museum | |
| Specialty | Medical genetics  |
| Symptoms | Fused legs |
| Complications | Malformations of organs |
| Usual onset | Birth |
| Causes | See Causes |
| Risk factors | ? |
| Treatment | Surgery |
| Prognosis | Usually die in infancy |
| Deaths | ? |
Sirenomelia, 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.