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Persistent ostium primum coexisting with mitral or tricuspid atresia.

Three cases of persistent ostium primum coexisting with atresia of an atrioventricular valve (tricuspid atresia in one case and mitral atresia in two cases) are described. The presence of a persistent ostium primum in association with an atretic atrioventricular valve allows easy escape of blood from the atrium with an atretic valve. To our knowledge, this association of anomalies has not been previously reportd.