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Figure 3 Spectrum of pathology in pulmonary atresia with intact ventricular septum. Right ventricular (RV) angiograms showing (A) dilated thin-walled RV and right atrium (RA) with severe tricuspid regurgitation and membranous pulmonary atresia (anteroposterior view); (B) so-called tripartite RV with membranous atresia (lateral view); (C) so-called bipartite RV with membranous atresia, with some RV-to-coronary fistulae (lateral view); (D) tiny so-called unipartite RV with muscular atresia and RV-to-coronary fistulae with retrograde filling of the aorta (lateral view).