Fig. 6

Left atrial angiosarcoma with multiple metastases. a MIP of ¹⁸F-FDG PET/CT revealed multiple bones and muscle metastasis with focal increased ¹⁸F-FDG uptake (black arrow, SUVmax 5.6–10.0) and severely increased ¹⁸F-FDG uptake by myocardium, due to lack of dietary preparation. b–d The transverse view of selected PET, CT, and fused PET/CT images revealed a brain metastasis with increased ¹⁸F-FDG uptake in the right parietal lobe (yellow arrow). e–g The transverse and h–j coronal view of selected PET, CT, and fused PET/CT images revealed a big mass with severely increased ¹⁸F-FDG uptake (white arrow, SUVmax 14.4), which located in the left atrium. k The transverse and l coronal view of CECT images revealed an irregular mass with moderately to intensely enhancement in the venous phase (white arrowhead). m The histopathology of biopsy of one of the muscle metastases revealed angiosarcoma (H&E, magnification, × 400)