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Newborn Milagros Cerrón
ICD-10 Q87.2
ICD-9 759.89
MeSH D004480

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Sirenomelia or Mermaid Syndrome is a very rare congenital deformity in which the legs are fused together, giving the appearance of a mermaid. This condition is found in approximately one out of every 70,000 live births[1] (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. Sirenomelia is associated with maternal diabetes.

There may be a connection to VACTERL association.

This disorder was formerly thought to be an extreme case of Caudal Regression Syndrome; however, it was reclassified to be considered a separate condition.

Notable cases

Only a handful of patients who did not have the usual kidney and bladder complications have survived this condition, three of them being:


  1. Kallen B, Castilla EE, Lancaster PA, Mutchinick O, Knudsen LB, Martinez-Frias ML, Mastroiacovo P, Robert E (1992). "The cyclops and the mermaid: an epidemiological study of two types of rare malformation". J Med Genet. 29 (1): 30–5. PMID 1552541.
  2. "'Mermaid' Girl Takes First Steps " - 26 September 2006 BBC article providing update on Milagros Cerron.
  3. Peru's 'miracle baby' walks on her own at San Francisco Chronicle, 20 April 2007
  4. [1] Milagros Cerron.
  5. "Peru's 'mermaid' girl doing well" at BBC News, 14 December 2005.
  6. Article in Daily Mail
  7. "Girl with Mermaid syndrome defies the odds", Portsmouth Herald, 2 August 2007

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