PMC6402212_01
Computed tomography without contrast revealed a large right renal mass with significant mass effect on the right kidney. Adjacent soft tissue nodularities were concerning for satellite nodules or metastatic disease.
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Computed Tomography (CT) revealed a 14 x 13 x 16 cm right renal mass almost completely replacing the interpolar region, with significant mass effect on the right kidney (Figures 1 and 2). Adjacent tissue nodularity in the perinephric fat was concerning for satellite nodules or metastatic disease (Figure 1).
Computed tomography without contrast demonstrating a large heterogeneous right renal mass.
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Computed Tomography (CT) revealed a 14 x 13 x 16 cm right renal mass almost completely replacing the interpolar region, with significant mass effect on the right kidney (Figures 1 and 2).
Computed tomography without contrast demonstrating left paraaortic mass, left interpolar renal mass, and large right renal mass.
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The left kidney was notable for multiple solid renal masses measuring 6.3 cm at the upper pole and 4.6 cm at the interpolar region (Figure 3). A left paraaortic soft tissue mass measuring 4.6 x 4.6 cm with associated calcification was concerning for adenopathy (Figure 3).
Gross specimen of right kidney containing maroon-colored mass with gray-white central scar.
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Grossly, the right kidney contained a spherical, encapsulated, and homogenous maroon-colored mass with a gray-white lobulated central scar (Figure 4).
Microscopic (100x) H & E stained tumor revealing nests of round and polygonal cells with granular, eosinophilic cytoplasm classic for oncocytoma.
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Histologic examination revealed nests of round and polygonal cells with granular, eosinophilic cytoplasm (Figure 5) consistent with oncocytoma.
Microscopic (40x) renal tumor cells demonstrated positive staining for CK7.
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The tumor cells were positive for CD117, CK7 (Figure 6), and weakly positive for CD10.
Cross sections of retroperitoneal ancient schwannoma with glistening tan-white surface.
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Cross sections of the left paraaortic mass revealed a smooth, encapsulated mass with a pearly and glistening tan-white surface (Figure 7).