PMC9430971_01
CT urogram showing 1.7-cm enhancing mass in the lower pole of right testicle.
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F1
He had stable disease for 2 years when a CT urogram revealed a 1.7-cm enhancing right lower pole testicular mass (Figure 1).
Ultrasound image showing 1.4 x 1.5 x 1.5 cm hypoechoic mass in the lower pole of right testicle.
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F2
Ultrasound showed a 1.5 cm hypoechoic, hypervascular right lower pole mass (Figure 2).
Gross and microscopic pathology of right radical orchiectomy specimen. (A) Well-circumscribed golden orange lesion (arrow) confined to the testicular parenchyma. (B) Solid nests of tumor (top right) separated by fibrous band adjacent to seminiferous tubules (bottom left) (100x magnification). (C) By immunohistochemistry, the tumor is positive for PAX8 (100x magnification). (D) Under higher magnification, the tumor cells show clear cytoplasm and prominent nucleoli (200x magnification).
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F3
These cells were positive for PAX8, further confirming renal origin (Figure 3).