%0 Case Reports
%T A tricky fetal case of isolated transposition of great arteries without the I-shaped sign.
%A Kawazu Y
%A Takahashi K
%A Tsujie T
%A Chayama K
%J J Obstet Gynaecol Res
%V 48
%N 12
%D Dec 2022
%M 36042690
%F 1.697
%R 10.1111/jog.15410
%X 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.