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Introduction Chloroma, also known as myeloid sarcoma, is a localized extramedullary tumour composed of malignant cells of the myeloid cell line, most frequently occurring in myelogenous leukemia. Heart involvement is exceptional, only about 20 cases have been reported in the literature. Case presentation A 38-year-old woman presenting with fatigue and pre-syncope was admitted to the hospital. The patient had a history of acute myeloid leukaemia diagnosed 2017, treated with chemotherapy and transplanted with allogenic bone-marrow the same year, remaining thereafter in clinical remission. Initial electrocardiogram showed sinus bradycardia and recurrent sinus arrests and therefore a pacemaker was implanted. An echocardiogram was performed which revealed multiple infiltrative masses with involvement of the superior vena cava extending to the right atrium, atrial septum, left atrium, mitral valve and aortic root. Magnetic resonance imaging was done confirming the echocardiographic results and showing even involvement of pulmonary veins, coronary arteries and myocardial infiltration. Chemoradiation was administered with initial response, however, disease progression led to the patients´death. Conclusion To our knowledge, this is the first case describing a chloroma with extensive involvement of cardiac walls, vessels and valves. This case also illustrates the value of echocardiography as a tool for early detection of cardiac masses. Abstract 473 Figure. Echo with contrast

473 Chloroma: an unusual case with extensive cardiac involvement detected by echocardiography