The incorporation of high-frequency transvaginal probes in commercial ultrasonic equipment allows now for the earlier detection of fetal malformations and the possibility of interrupting pregnancy when such an anomaly is incompatible with postnatal life. We describe here a case of alobar holoprosencephaly associated with serious facial anomalies, diagnosed via transvaginal sonography during the 10th week of amenorrhea. A cytogenetic study was carried out by transabdominal chorial biopsy and diagnostic confirmation by necropsy was made after termination. In order to be able to counsel patients on the advisability of future pregnancies we stress the importance of making a cytogenetic study of the embryo.
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