International Society for Heart and Lung Transplantation working formulation of a standardized nomenclature for cardiac allograft vasculopathy—2010

Anatomic abnormalities in transplant coronary vascular disease.⁶ Type A lesion: discrete, tubular or multiple stenoses. Type B₁ lesion: abrupt onset with distal diffuse concentric narrowing and obliterated vessels. Type B₂ lesion: gradual, concentric tapering with distal portion having some residual lumen. Type C lesion: narrowed irregular distal branches with terminations that are often non-tapered and squared off, ending abruptly.