[Clinical presentation, diagnosis and treatment of four cases of cor triatriatum].

We report four cases of cor triatriatum. In two of them the fibromuscular membrane was obstructive and associated with an atrial septal defect between the left atrial accessory chamber and the right atrium; in those cases the clinical findings were due to the pulmonary hypervascularity. The third case was associated to a small patent foramen ovale, and the clinical findings were due to the obstruction to flow through the membrane in the left atrium, producing venocapilar pulmonary hypertension. In these three cases surgical treatment was carried out through a right atriotomy. In all of them a good corelationship was found between the echocardiographic and the surgical findings. The follow-up has been good, all previous symptoms disappearing, remaining symptom free. The fourth case is an asymptomatic 5-year-old girl, with a non-obstructive membrane and without any associated anomalies.