Abstract
Cor triatriatum dextrum is an exceptionally rare congenital heart disease, in which the right atrium is partitioned into two chambers by a membrane to form a triatrial heart. It is caused by persistence of the right valve of sinus venosus. The aim of presenting this case is to highlight that cor triatriatum dextrum though rare can result in right heart failure, mimicking other common causes of heart failure such as mitral valve disease. 2D-echocardiography is an important tool in making early and accurate diagnosis. We report a case of an adult Nigerian with cor triatriatum dextrum presenting with pulmonary hypertension in heart failure that was initially misdiagnosed as pulmonary tuberculosis with right heart failure at the referring center, and then mixed mitral valve disease clinically by us prior to echocardiographic assessment.
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