case_images: PMC10176196_01
case_images: Initial CT scan of patient with infiltrating urothelial carcinoma, sarcomatoid variant.
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case_images: F1
case_images: CT scan with contrast demonstrated a 1.3 cm x 1.3 cm x 1.4 cm mass in the 1/3 distal of the right ureter with hydroureter and hydronephrosis (shown in Fig. 1).
case_images: a Macroscopic tissue of the kidney and ureter. b On lamellar excision of the kidney, multiple lobes filled with reddish-yellow fluid were seen with a mass filling the lumen of the ureter.
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case_images: F2
case_images: Postsurgical gross examination found a mass filled the lumen of the ureter with a size of 5.5 x 3 cm with a distance of 6 cm from the tip of the distal ureter and 2.5 cm from the renal pelvis (shown in Fig. 2a, b).
case_images: Microscopic ureter mass. Pleomorphic transitional epithelial proliferation mixed with sarcomatoid components arranged in fasciculus with spindle-shaped enlarged nuclei, coarse and hyperchromatic, mitosis easy to find (HE, x100).
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case_images: F3
case_images: Morphologic and immunohistochemistry findings were consistent with infiltrating urothelial carcinoma with some focus showing the sarcomatoid component consisted of pleomorphic cells arranged in fasciculus with spindle-shaped nuclei, coarse chromatin with partially hyperchromatic, mitosis is easily found, and eosinophilic cytoplasm (shown in Fig. 3).
case_images: PET-CT scan showed that there was no suspicious residual malignancy in the kidney post-RNU and post-chemotherapy.
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case_images: F4
case_images: The PET-CT scan results showed no suspicious residual malignancy or malignancy/metastasis in the left kidney and no metastasis in the lymph nodes, lungs, heart, and bones (shown in Fig. 4).