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Disease definition

Sirenomelia is a lethal congenital anomaly that is characterized by a single midline lower limb, sacral and pelvic bone anomalies, aberrant abdominal umbilical artery (persistent vitelline artery), absent external genitalia, imperforated anus, renal dysgenesis or agenesis and facial dysmorphism (Potter's facies; large, low-set ears, prominent epicanthic fold, hypertelorism, flat nose and receding chin). Sirenomelia may be considered as the severe end of a spectrum of caudal regression sequence (see this term). It shares some features with VACTERL/VATER association (see this term): vertebral anomaly, anorectal malformation, cardiac defect, tracheo-oesophageal fistula, renal and limb anomaly. Risk factors include maternal diabetes, teratogens, genetic factors and maternal age < 20 years.


  • Synonym(s): -
  • Prevalence: <1 / 1 000 000
  • Inheritance: Not applicable 
  • Age of onset: Neonatal, Antenatal
  • ICD-10: Q87.2
  • OMIM: 600145
  • UMLS: C0037205
  • MeSH: C538595
  • GARD: 7652
  • MedDRA: 10049216

Detailed information


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