CTICasesCongenitally Corrected Transposition of the Great Arteries (L-TGA)
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Imaging findings
Cardiac MRI shows L-looping ventricles with ventricular inversion, where the morphologic right ventricle is positioned on the left and the morphologic left ventricle is on the right (double switch). The aorta arises anteriorly and to the left, while the pulmonary artery arises posteriorly. The pulmonic valve is bicuspid, and subpulmonic stenosis is also present.
Key takeaways
L-transposition of the great arteries (L-TGA), also known as congenitally corrected TGA (ccTGA), features both atrioventricular and ventriculoarterial discordance. Although physiologically "corrected" and compatible with a long, relatively asymptomatic life, the morphologic right ventricle functions as the systemic ventricle and is prone to eventual failure under systemic pressures. Regular monitoring of right ventricular volume and function is required.
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