Introduction:

the sirenomelia dates from the sixteenth century, stage in which those affected were supposed to be "monsters", and were sacrificed or hidden by families. It happens on a worldwide scale and in all races. It is more common in males, in monozygotic twin pregnancies and in children of mothers under 20 or over 40 years.

Objective:

to socialize the experience of prenatal diagnosis of sirenomelia, in order to systematize theoretical references that familiarize general practitioners with the clinical characteristics, the etiopathogenesis and the diagnosis of this disease, multisystemic and lethal.

Method:

Two cases of sirenomelia diagnosed by prenatal ultrasound were presented at the “Dr Agostinho Neto Hospital” in Guantánamo during the years 2014-2017.

Results:

the definitive diagnosis of type I and type II sirenomelia was established according to the classification of Stocker and Heifetzy Simelia Dipus according to the Foerster criteria.

Conclusions:

the professional performance should be directed to the prenatal diagnosis, in order to guide the interruption of the pregnancy since medical interventions are not available to improve the prognosis of the fetus or the newborn with sirenomelia.

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