Rare variant of truncus arteriosus with intact ventricular septum and hypoplastic right ventricle

A three week old girl was admitted to hospital with severe congestive heart failure and cyanosis. Cross sectional and Doppler echocardiography and cardiac catheterisation showed a unique variant of truncus arteriosus with an intact ventricular septum. The trunk rose only from the left ventricle and was associated with a hypoplastic right ventricle with sinusoids to the right coronary artery.