Mermaid syndrome: Rare genetic anomaly.

Mermaid syndrome (Sirenomelia) is a rare fatal congenital anomaly. The prevalence is reported to be 1 in 100,000 births. The baby appears to have a fish-like tail and joined legs featuring a mermaid at the time of birth or during antenatal screening. Most of these patients die shortly after birth, denoting rare survival rate. Gastrointestinal and genitourinary obstruction with single umbilical artery are the clinical symptoms. Two important hypotheses support the Sirenomelia disorder: the artery steal hypothesis, called the vitelline artery, and the blastogenesis defect hypothesis. There is no known reason for MS, but certain risk factors need to be identified, which include mother aged more than 40 years or less than 20 years at the time of giving birth, cousin marriage, exposure to teratogenic agents, and family history. A case of this rare congenital disorder was seen in Civil Hospital Faisalabad, Pakistan, which was referred from Duniyapur, District Lodhran, Pakistan. The neonate presented with fused lower limbs, congenital heart disease, and high-grade fever. The mother had a history of gestational diabetes mellitus and hypertension. The baby had fused legs, unidentified internal and external genital system, thumbs anomaly, bile in vomit, and despite life-saving efforts, the patient expired after five days of birth. There is lack of information regarding symptoms and a lack of prenatal screening for MS. Hence, there is a need to create awareness among health care professionals to identify the disease on screening for early diagnosis.