Transposition of the great arteries is a rare congenital heart malformation associated with significant perinatal morbidity and mortality. Prenatal diagnosis is possible after detailed examination of the fetal heart and knowledge of the ultrasound appearance of the two types of transposition--complete and corrected form. We present a case report of antenatally diagnosed complete transposition of the great arteries in 22 weeks of gestation and discuss the difficulties in prenatal diagnosis.
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