case_images: PMC10591103_01
case_images: The CT image shows a mixed-density mass in the left kidney ((A), arrow). The MR examination shows a mixed solid-cystic mass with unclear boundaries in the left kidney ((B), arrow).
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case_images: PMC10591103_01_fonc-13-1175518-g001.jpg
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case_images: Abdominal computed tomography (CT) (Figure 1A) revealed a mixed-density mass in the left kidney. Magnetic resonance imaging (MRI) revealed a mixed solid cystic mass in the left kidney (Figure 1B).
case_images: Photomicrograph shows many densely distributed invasive tumor cells are arranged in bundles and braided shapes, with collagen-rich interstitial fluid ((A), HEx100). The size of tumor cells varies, while the cytoplasm and chromatin are coarse, and partial mitosis is present ((B), HEx200).
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case_images: PMC10591103_01_fonc-13-1175518-g002.jpg
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case_images: Microscopic examination using hematoxylin-eosin staining revealed numerous spindle cell proliferations with interspersed osteoid calcifications (Figure 2).