Masked cor triatriatum.

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Abstract
Two children, aged 22 months and 4 years with cor triatriatum, have been described. Both had, in addition, pulmonary hypertension and one had hemi-anomalous drainage of the left pulmonary veins into the left innominate vein. The accessory membrane in the left atrium was excised under direct vision in both patients. The importance and difficulties of recognizing the left atrial obstruction in young children who present as atrial septal defect with pulmonary hypertension have been emphasized. Diagnostic features on the plain chest radiograph and angiocardiogram have been illustrated.