Sirenomelia or Mermaid Syndrome is a very rare disorder in which the legs are fused together, giving the appearance of a mermaid. This condition is found in approximately one out of every 100,000 live births (about as rare as conjoined twins) and is usually fatal within a day or two of birth because of complications associated with abnormal kidney and bladder development and function. It results from a failure of normal vascular supply from the lower aorta in utero.
Only a handful of cases of patients, who did not have the usual kidney and bladder complications, have survived this condition, two of them being Tiffany Yorks of the United States and Milagros Cerrón of Peru. Both were treated with heavy plastic reconstructive surgery.

BBC News: Doctors hail 'mermaid' operation - Doctors in Peru say they have successfully operated to separate a one-year-old girl's fused legs.
Meta Description: [ Doctors in Peru say they have successfully operated to separate a one-year-old girl's fused legs. ]
Indian Pediatrics - Infantogram of a baby with Sirenomelia.
International Sirenomelia Study - A research project to collect DNA samples to research the condition. Downloadable clinical sheet for those who wish to participate in the study. [English/French]
Meta Description: [ Home page of sirenomelia.org / page d'accueil de sirenomelia.org ]
Peru 'Mermaid' Has Oxygen Therapy, Doing 'Great' - A Peruvian baby dubbed the Little Mermaid because of a rare birth defect in which her legs are fused, is making good progress after initial surgery to prepare her legs for separation, her doctor said on Monday.
Meta Description: [ CORRECTED: Peru 'Mermaid' Has Oxygen Therapy, Doing 'Great' ]
Shriners patient gives thanks to those who saved her life - Shriners patient gives thanks to those who saved her life
Meta Description: [ Shriners patient gives thanks to those who saved her life ]
Sirenomelia - Wikipedia article.
The Fetus Net - An article by Sandra R Silva, MD and Philippe Jeanty, MD, PhD
The Internet Pathology Laboratory - Page contains two links to photographs of the condition.
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