Fig. 2

The formalin-fixed specimen (left) and DW CMR tensor field (right) in linear glyph format of explanted hearts from: a- a 16yo with mitral and aortic atresia (MA/AA), b- a 5 yo with double-inlet, double-outlet RV (DIRV), c- a 19yo with physiologically corrected transposition of the great arteries, atrio-ventricular and ventriculo-arterial discordance (C-TGA) and d- a 1yo boy with a structurally normal heart and postnatally acquired RV hypertrophy (RVH ‘normal’). In the 3 hearts with a systemic RV there is an outer compact, circumferential layer (C) and a thicker inner trabecular layer (T) with bundles of fibers running at large angles to each other. The RVH ‘normal’ heart was smaller than the other 3. Expanding the image to match the size of the other 3 hearts resulted in lower density of glyphs in the tensor field image. It has an external compact layer of nearly circumferential fibers with more longitudinally oriented, discrete fiber bundles internally, similarly to what has been reported for a normal RV but with thicker layers due to hypertrophy