transposition of great arteries l-loop transposition of the great arteries 2023-12-04T08:07:29Z congenitally corrected TGA a type of transposition of the great arteries (TGA) in which the aorta is positioned to the left and front of the pulmonary artery; it is characterized by atrioventricular and ventriculoarterial discordance and usually associated with ventricular inversion due to leftward looping of the primitive heart tube L-transposition of the great arteries L-looped transposition of the great arteries ventricular inversion double discordance CCTGA MP:0031515 MPheno.ontology congenitally corrected transposition of the great arteries L-TGA is commonly referred to as congenitally corrected TGA since the blood flows in the correct physiologic direction, resulting in normal oxygenation of the systemic venous return via the abnormally placed ventricles and great arteries. levo-transposition of the great arteries levotransposition of the great arteries L-TGA