RESUMO
Cor triatriatum is an acyanotic congenital heart disease. We present a rare case of cor triatriatum sinistrum in a 6-month-old female infant who was presented with cyanosis and failure to thrive. The 2D transthoracic echocardiography and the Doppler color flow imaging showed a proximal venous chamber communicating to the distal left atrium through restrictive opening to the low-pressure, distal left atrial chamber. The Saline Contrast Echocardiography confirmed a right-to-left atrial shunt due to a minor atrial septal defect. The defect was caused by a persistent pulmonary hypertension which had raised the right atrial pressure in the infant. To the best of our knowledge, barely any such cases have been reported in the literature so far. Our report highlights the clinical utility of the Saline Contrast Echo in other cases of congenital heart diseases