Abstract：
Isolated transposition of the great arteries (TGA) is a congenital heart disease that presents with severe cyanosis after birth and a fetal diagnosis is crucial for the preservation of life. The I-shaped sign (I-sign) is useful as a fetal screening method for TGA. We herein present a tricky fetal case of isolated TGA with a side-by-side position of the great arteries and no I-sign. Severe cyanosis immediately after birth necessitated urgent interventions. A potentially fatal outcome was prevented by a prenatal diagnosis. In the fetal diagnosis of isolated TGA, it is important to not only detect the I-sign, but also conventionally examine the ventricular outflow tract.
摘要：
孤立的大动脉转位（TGA）是一种先天性心脏病，出生后会出现严重的紫癜，胎儿诊断对于挽救生命至关重要。I形标志(I-sign)可用作TGA的胎儿筛查方法。我们在此提出了一个棘手的胎儿病例，即孤立的TGA，其大动脉并排位置且无I征。出生后立即出现严重的紫癜需要紧急干预。产前诊断可以防止潜在的致命结果。在孤立性TGA的胎儿诊断中，重要的是不仅要检测到I-sign,但也常规检查心室流出道。
