By means of colour Doppler ultrasound, veno-venous shunts were found in 3 cases, leading to the diagnosis of Budd-Chiari Syndrome. Pulsed and colour Doppler ultrasound showed a reduction in venous blood flow and the reversal of blood flow in the venous collaterals. Venous spectral Doppler wave forms in the veno-venous shunts were flattened and aphasic in all cases. Sonographic findings were confirmed by cavography. Our cases show that pulsed and colour Doppler ultrasound are a valuable tool in the initial diagnosis of veno-venous shunts associated with Budd-Chiari Syndrome.