An 18-year-old man, without medical history, was evaluated because of palpitations. He was in sinus rhythm. Holter tape recording revealed minor nocturnal conduction disturbances. Transthoracic echocardio-graphy (TTE) showed a normal systolic and diastolic function. The four chambers were within normal limits. Cor triatriatum was suspected, as a membrane, dividing the left atrium in two parts, was seen (figure 1). Doppler flow patterns did not fit with elevated right ventricular pressure. Transoesophageal echocardiog-raphy (TEE) confirmed a cor triatriatum. A membrane, originating from the inflow region of the pulmonary veins, divided the left atrium in two parts (figures 2 and 3). Several flows through the membrane were demonstrated (figure 4), but CW Doppler measurements could not document a relevant gradient. The mitral valve complex was normal and there were no other left-sided flow obstructions.
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