case_images: PMC7229403_01
case_images: Radiographic pictures. Anteroposterior (A) and lateral (B) projections showed lytic lesion in the area of subtrochanter of the left femur with pathological fracture and soft tissue swelling.
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case_images: He was brought to a private hospital in Yogyakarta and X-ray examination was performed, showing a fracture and soft tissue mass in the left proximal femur (Fig. 1).
case_images: Mesenchymal tumor epitheloid shape with increased cellularity, arranged in solid and alveolar fashion and infiltrative to surrounding soft tissue. (HE, x40).
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case_images: Histologic section showed mesenchymal tumors with increased cellularity, arranged in solid and alveolar fashion and infiltration to surrounding soft tissue (Fig. 2).
case_images: Epitheloid cells, small to moderate in size, eosinophilic cytoplasm, with caudated appearance mimicking rhadomyoblast. Round to oval nuclei, some spindle nuclei are found with irregular chromatin, and prominent nucleoli. (HE, x400).
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case_images: Eosinophilic cytoplasm was visible with caudated appearance and round to oval nuclei, while some spindle nuclei were found with irregular chromatin, and prominent nucleoli (Fig. 3).
case_images: Strong diffuse positive stained with vimentin, x400.
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case_images: Immunohistochemistry examination revealed vimentin (Fig. 4) and CK positive expression (Fig. 5), while myogenin was negative (Fig. 6).
case_images: Negative stained with myogenin, x400.
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case_images: Immunohistochemistry examination revealed vimentin (Fig. 4) and CK positive expression (Fig. 5), while myogenin was negative (Fig. 6).
case_images: Positively stained with CD34 in blood vessel cells membrane, negatively stained in tumor cells, x400.
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case_images: Further immunostaining using CD34 (Fig. 7) and HMB45 were also negative (Fig. 8).