A case of right coronary to left ventricular fistula was diagnosed by cross sectional and Doppler echocardiography. The origin and site of entry into the left ventricle of the enlarged right coronary artery were shown by cross sectional echocardiography. Diastolic flow was detected in the left ventricle by both pulsed and continuous Doppler echocardiography. The fistula was confirmed by cardiac catheterisation and was successfully closed at operation.
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