case_images: PMC11832086_01
case_images: (a and b) Preoperative contrast-enhanced computerized tomography shows a well-defined large upper pole renal tumor encased within a pseudocapsule
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case_images: Contrast-enhanced computerized tomography revealed a well-marginated hypodense mildly enhancing mass lesion at the upper pole of the left kidney of size 3.8 cm x 3.5 cm [Figure 1a and b]. Given the pseudocapsule seen on imaging [Figure 1a], the diagnosis of WT was entertained above the differential of congenital mesoblastic nephroma.
case_images: Resected specimen after nephron-sparing surgery A (partial nephrectomy)
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case_images: The patient underwent open left NSS A (partial nephrectomy) [Figure 2].
case_images: Histopathology revealed the tumor to be a triphasic tumor (H and E, x400)
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case_images: Histopathology revealed Stage I triphasic WT (mixed type, intermediate risk) with multifocal perilobar nephrogenic rests in adjoining parenchyma [Figure 3].