[Prenatal echographic diagnosis of conjoined twins after 20 weeks of amenorrhea].

Conjoined twins are a rare entity in human teratology. Because early diagnosis of conjoined twins is so difficult as to be almost impossible it is usually only made in labour. Recent progress in the use of ultrasound as a means of diagnosis and also advances in neonatal surgery have stimulated a renewed interest in this malformation. A recent case at the University Hospital Centre of Habib Thameur in Tunis made it possible for us to diagnose the condition after 20 weeks of amenorrhoea and to terminate the pregnancy.