case_images: PMC11221945_01
case_images: The echocardiography view of the lesion (a heterogeneous rounded atrial mass lesion (1.72   1.95 cm2)).
case_images: CRIPE2024-8630268.001.jpg
case_images: PMC11221945_01_CRIPE2024-8630268.001.jpg
case_images: fig1
case_images: TR, mild mitral regurgitation (MR), PDA (2.6 mm), and normal right ventricular (RV) function were detected (Figure 1).
case_images: PMC11221945_02
case_images: (a) Microscopic examination (H&E stain) shows that cellular neoplastic tissue contains bland-looking spindle cells in myxoid stroma with some small- and medium-sized vascular channels with scattered inflammatory cells. (b) Cellular atypia and necrosis are not seen.
case_images: CRIPE2024-8630268.002.jpg
case_images: PMC11221945_02_CRIPE2024-8630268.002.jpg
case_images: fig2
case_images: No atypia or mitoses were noted (Figures 2 and 3).
case_images: Immunohistochemical studies show positive reaction with vimentin (a), CD34 (b), CD31 (c), factor VIII (d), desmin (e), smooth muscle actin (f), ERG (not shown) and negative reaction with S100 (g), and calretinin (h). KI67 is positive in about 15% of tumor cells (i).
case_images: CRIPE2024-8630268.003.jpg
case_images: PMC11221945_02_CRIPE2024-8630268.003.jpg
case_images: fig3
case_images: No atypia or mitoses were noted (Figures 2 and 3).
case_images: Macroscopic image of mass after surgical removal (a) and intraoperative view of the mass (b).
case_images: CRIPE2024-8630268.004.jpg
case_images: PMC11221945_02_CRIPE2024-8630268.004.jpg
case_images: fig4
case_images: Intraoperative and postresection evaluation of the tumor confirmed the radiologic size and macroscopic features (Figure 4).