PMC7443239_01
Patient preoperative imaging revealing the renal mass (white arrows). (a) Sagittal ultrasound image of the echogenic, solid renal mass measuring 1.75 cm by 1.96 cm. (b, c) Axial CT images with contrast highlighting the posterior location of the mass, its enhancing posterior wall, and nearness to the collecting system. (d) Coronal CT image of the same mass and its upper pole location. No calcifications were noted throughout the mass.
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fig1
The R.E.N.A.L. nephrometry score was calculated at 7p (Figure 1).
(a) Hematoxylin and eosin-stained sections representative of tumor with nuclear pseudostratification and nuclear enlargement consistent with papillary renal cell carcinoma type 2. Granular to eosinophilic cytoplasm is also seen. (b) A low power view with heterotopic ossification with intervening tumor. (c, d) On higher power, focal osteoblastic rimming is seen surrounding trabecular woven bone.
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International Society of Urologic Pathologist (ISUP) grade 2 as evidenced by Figure 2(a). Irregular deposits of bone could be seen intermixed with the tumor cells (Figures 2(b)-2(d)).