
Sirenomelia is a lethal birth defect of the lower body characterized by apparent fusion of the legs into a single lower limb giving the appearance of a mermaid's tail. The condition only occurs in one of every 100,000 births, with persons passing within 48 hours of birth.
Mermaid Girl Shiloh Pepin became famous when a recent documentary was made about Sirenomelia. Shiloh Pepin is one only three people in the world surviving with sirenomelia.