Fig. 1

Im: Case no. 1: Metastatic melanoma in the right atrium - Imaging. a – Axial non contrast CT section (part of the positron emission tomography CT): no obvious mass is demonstrated in the RA (red arrow) due to the lack of contrast administration. b – positron emission tomography CT, axial section demonstrating the right atrium mass with significant fluorodeoxyglucose uptake (red arrow), consistent with high metabolic activity. c – Whole body positron emission tomography CT, coronal section, the right atrium mass depicts substantial fluorodeoxyglucose uptake (red arrow). d – Fused positron emission tomography CT image, axial section (parallel to a & b) showing the right atrium mass along with the fluorodeoxyglucose uptake (red arrow). Fig. 1 H: Case no. 1: Metastatic melanoma in the right atrium - Histology. a - Cardiac muscle is seen in the upper part, separated by fibrosis and mild inflammatory infiltrate from a metastatic melanoma mass seen in the lower part, HE X100. b – Metastatic melanoma growing in solid sheets of cells. The melanoma cells show typical features of abundant cytoplasm, large nuclei with prominent nucleoli, occasional intranuclear inclusions (wide short arrow), bizarre atypical cells (thin long arrow) and numerous mitotic figures (thin short arrow), HE X400