MITRAL-VALVE ANOMALIES OBSTRUCTING LEFT-VENTRICULAR OUTFLOW

This paper reports on two cases of more uncommon types of subaortic st enosis. A 2-year-old boy was found with accessory mitral valve leaflet (AMVL) attaching to the anterior leaflet. ballooning into the subaort ic ventricular septum associated with a discrete subaortic membrane. T he obstruction was successfully relieved by removal of the AMVL and re section of the membrane. A 19-day-old newborn with accessory tissue on the mitral valve (AMVT) causing subaortic stenosis, subaortic ventric ular septal defect (VSD) and patent ductus arteriosus was operated on successfully. Accessory tissue excision through the VSD, VSD patch clo sure and ductus ligation were performed. (C) 1997 Elsevier Science B.V .