Monochorionic diamniotic twins with concordant dextro-transposition of the great arteries: strengthening the case for genetic underpinnings

Abstract Dextro-transposition of the great arteries is a critical CHD traditionally considered sporadic, with low familial recurrence. Emerging evidence suggests a genetic component in select cases, particularly with rare familial clustering. We report concordant d-TGA in monochorionic diamniotic twins, a highly unusual occurrence, strengthening the argument for a heritable predisposition.