Sirenomelia is a rare congenital anomaly, not compatible with life, characterised by roatation and fusion of legs, which appears like fish tail, giving its common name'' mermaid syndrome''. genitourinary and gastrointestinal anomalies are frequently associated with it. very few cases are reported worldwide. We found a case in a dizygotic, diamniotic pregnancy with fusion of lower limbs. There were no external genitals and anal opening. Etiology of this syndrome remains unclear, however many hypothesis have been proposed mainly vascular steal phenomenon. Maternal diabetes mellitus and genetic factors are also associated. Diagnosis at early pregnancy by ultrasonography is possible and need careful attention so that termination of pregnacy can be done safely.

1.      Duhamel B from the mermaid to anal imperforation : The syndrome of caudal regresson. Arch Dis Chil 1961:36:152-154.

2.      Goadlaw OG, McCoy Sibley RI, Allen BG, Kamanda WS Gullattee : Sirenomelia : Mermaid syndrome. J nat Med Ass 1988 : 80:343-346

3.      Kallen B WinbergJ : Caudal mesoderm pattern of anomalies : From rectal agenesis to sirenomelia. Teratology 1974 : 90:99-112

4.      Rabbe R, Hamsberger HR, Lee TG, MukunoDH :Ultrasonographic antenatal diagnosis of mermaid syndrome : Fusion of lower extremity. J. Ultrasound Med 1983:2:463-464.

Dr Manisha Chauhan

Senior Resident, S.N. Medical College, Agra (U.P)

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