case_images: PMC10310325_01
case_images: Echocardiogram with transthoracic Doppler showing a mass in the region. Source: Image provided by the patient.
case_images: can-17-1562fig1.jpg
case_images: PMC10310325_01_can-17-1562fig1.jpg
case_images: figure1
case_images: She underwent transthoracic echocardiography (Figure 1), which showed cavitary enlargement of the left atrium, moderate to important mitral stenosis with mass adhered to the anterior leaflet, a systolic function of the left ventricle preserved at rest and mild aortic and tricuspid insufficiencies.
case_images: Immune-histochemistry. Source: Image provided by the patient.
case_images: can-17-1562fig2.jpg
case_images: PMC10310325_01_can-17-1562fig2.jpg
case_images: figure2
case_images: The morphology described was myxoid fusocellular tumour with cellular anaplasia, and the immunohistochemical study with desmin (Figure 2) showed that the neoplastic cells were positive for D33 and smooth muscle actin 1-4; and negative for CD34, AE1/AE3, FSD and protein S100; findings compatible with undifferentiated high-grade LMS in the left atrium.