case_images: PMC9263610_01
case_images: Computed tomography (CT) shows a mass from the left subclavian vein and the internal jugular vein to the left brachiocephalic vein.
case_images: 10.1177_2050313X221109435-fig1.jpg
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case_images: fig1-2050313X221109435
case_images: Contrast-enhanced CT showed a strongly enhanced mass, suggesting an intravascular tumor (Figure 1).
case_images: (a) Preoperative view of the tumor (arrow). (b) The tumor is resected and closed with a bovine pericardial patch (arrow).
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case_images: PMC9263610_01_10.1177_2050313X221109435-fig2.jpg
case_images: fig2-2050313X221109435
case_images: The defect was closed with a bovine pericardial patch to maintain a tubular shape (Figure 2).
case_images: (a) The mass measured about 12 mm x 8 mm. (b) Epithelial-like cells are arranged in a cord-like manner against a fibromyxoma-like substrate. (c) The tumor shows positive staining for CD31. (d) The tumor shows positive staining for factor VIII-related antigen.
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case_images: fig3-2050313X221109435
case_images: Immunohistochemical staining was positive for cluster of differentiation (CD) 31, CD34, and factor VIII-related antigen and was negative for epithelial membrane antigen, alpha-smooth muscle actin, S-100, neurofilament, and human melanoma black-45, indicating the presence of EHE (Figure 3).