[In utero diagnosis of situs abnormalities. A case of prenatal diagnosis of visceral situs inversus with corrected transposition of great vessels].

A case of situs inversus with discordant atrio-ventricular and ventriculo-arterial structures was diagnosed at the ultrasonography examination performed at 34 weeks gestation. This observation underscores the importance of recognizing the position of the viscerae and discordant segments of the heart, atria, ventricles and greater vessels. Overall frequency of situs inversus is estimated at 1/10,000 births. It is often associated with an inborn cardiopathy, especially corrected transposition of the greater vessels resulting from abnormal rotation of the cardiac tube. The anatomic, pathologic, embryologic, etiologic and and sonographic features of situs inversus and related anomalies of the cardiac structures is presented.