Hypoplastic Left Heart Syndrome (HLHS) with mitral stenosis and aortic atresia. This patient had a Norwood/Sano operation. This model is coloured to show the deoxygenated (blue) blood and oxygenated (red) blood, which mixes within the heart (indicated as purple). The colouring is meant to explain the physiology and blood flow in a heart after a Norwood/Sono procedure.