doi:10.1016/j.jtcvs.2003.12.029 Congenital left ventricular diverticulum is a very rare condition usually associated with other congenital anomalies, including those of the sternum, diaphragm, pericardium, and abdominal wall (Cantrell syndrome). We describe a 31⁄2-yearold boy with a huge, isolated, congenital left ventricular diverticulum and no other congenital anomaly, the third reported case of its kind and the first of such large dimensions.