Cor triatriatum is an uncommon congenital anomaly. Abbott (1946) reported only seven cases in 1000 necropsies of congenital heart disease and there were only four examples in 3740 autopsies performed at the Buffalo Children's Hospital from 1936 to 1948. It has been estimated that 75 per cent of cases die in infancy (Keith et al., 1958) and eighteen of the thirty-nine cases so far reported have ...
