Left Ventricular-Right atrial canal, which permits a communication between the left ventricle and right atrium has been reported with increasing frequency. Kirby made the first successful surgical correction in 1957. Recently we experienced 3 cases of left ventricular-Right atrial canal, which were corrected surgically. In one patient the diagnosis of left ventricular-Right atrial canal had been suggested before operation. Preoperative diagnosis had been incorrect in 2 cases; one as an atrial septal defect and the other as combined atrial septal defect and ventricular septal defect. The entire patients were discharged with good results within 2 weeks after operation.