PMC9947728_01
Contrast-enhanced computed tomography images. Arrow indicates mass in the antero-mid-lower part of the right kidney with an axial diameter of 167x146 mm, a heterogeneous mass of soft tissue density with central necrosis, consistent with RCC.
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FIG1
Contrast-enhanced abdominal computed tomography (CT) revealed a mass in the antero-mid-lower part of the right kidney with an axial diameter of 167x146 mm, a heterogeneous mass of soft tissue density with central necrosis, consistent with RCC (Figure 1).
Macroscopic pictures of mass. A: Ureter; B: normal kidney parenchyma; and C: mass.
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FIG2
On macroscopic examination of the nephrectomy material, the right kidney measured 19x18x9.5 cm and had a 6.3 cm ureter above it (Figure 2).
Histopathological examination of the tumor. A. Solid-nested architecture and small islands of oncocytoma x40 hematoxylin and eosin (H&E). B. Solid-nested architecture of oncocytoma x100 H&E. C. The eosinophilic cells with granular cytoplasm and round nuclei x400 H&E. D. The large eosinophilic cells of the oncocytoma x200. E. The tumor shows immunoreactivity for CD117 (KIT) x100 (immunohistochemistry).
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FIG3
The final diagnosis was a stage II (pT2bNxMx) oncocytic renal neoplasm with low malignant potential (Figures 3A-3E).