PMC5929394_01
Gross specimen with whitish solid mass in renal pelvis, ureter and kidney
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PMC5929394_01_ijp-13-089-g002.jpg
F2
The tumor also involved the ureter with marked dilatation, irregular nodularities on the surface of upper ureter, wall thickening and intraluminal extension (Figure 2a). The focal epithelial component was formed by islands of urothelial carcinoma with carcinoma in situ in the urothelium of renal pelvis (Figure 2c, 2d). 
Section showing sarcomatous area with abundant osteoid production (H&E stain X 200
ijp-13-089-g003.jpg
PMC5929394_01_ijp-13-089-g003.jpg
F3
The sarcomatous component was found to have positive results for vimentin (Figure 3 a, b). 