A tricky fetal case of isolated transposition of great arteries without
the I-shaped sign
Abstract
Isolated transposition of great arteries (TGA) is a congenital heart
disease that presents with severe cyanosis after birth and a fetal
diagnosis is crucial for preserving 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 in the side-by-side arterial position without
the I-sign. Severe cyanosis immediately after birth necessitated urgent
interventions. Death was prevented because of the fetal 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.