PMC9760415_01
A computerized tomography (CT) scan showed: (A) Mass in the right kidney (arrow), two masses were attached to the liver tightly (arrow). (B) Oblique view of mass in the right kidney with low enhancement (arrow).
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F1
There was some fat stranding around the masses but no signs of organ invasion (Figure 1).
(A) Short fascicles of spindled myofibroblastic cells without overt atypia admixed with acute and chronic inflammatory cells (200x). (B) Ganglion-like polygonal cells with large rounded nuclei and prominent nucleoli (400x). Immunohistochemistry (IHC) analyses revealed positive reaction for (C) smooth muscle actin (SMA) and (D) Ki-67 (5%).
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F2
The mitotic activity was low, with only 5-10 mitoses per 10 high power fields (HPFs) (Figure 2).
Immunohistochemistry (IHC) analyses revealed negative reactions for (A) CD34, (B) Activin receptor-like kinase (ALK), (C) Pan-cytokeratin, and (D) Desmin.
JKCVHL-9-014-g003.jpg
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F3
Immunohistochemistry (IHC) analysis was positive for smooth muscle actin (SMA) and Ki-67 (5%), and negative for CD99, CD34, activin receptor-like kinase (ALK), STAT6, Pancytokeratin, and Desmin (Figure 3).