PMC5586721_01
Abdominal CT scan identified a 9.0 x 12.0 cm clear-margined and internally heterogeneous solid tumor (arrow) located at the right renal lower polar.
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F1
The right renal upper polar was compressed with concurrent cortical atrophy and hydronephrosis, the right renal vein was compressed and displaced, and the adrenal glands exhibited a normal size and shape (fig. 1).
Histology (a) and CD99 (MIC) immunohistochemistry (b) of the renal PNET (400x).
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F2
Tumor cells were clustered into the loose rose-ring-like architecture (fig. 2a). Immunohistochemistry of paraffin sections revealed CD99 (+) (fig. 2b), vimentin (+), CgA (-), Sy (+), and EMA (-), confirming the diagnosis of renal PNET.