case_images: PMC11783206_01
case_images: Pathology findings: Hematoxylin and Eosin stains of the ureteroscopic biopsy at 40x magnification (A) and 100x magnification (B) show polypoid protrusions without branching of papillae. The lamina propria ranges from edematous to fibrotic and contains delicate vessels with congestion. There is mild chronic inflammation. No significant urothelial atypia is present.
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case_images: PMC11783206_01_gr1.jpg
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case_images: Pathologic examination of the biopsy showed polypoid lesions and mild chronic inflammation without atypia (Fig. 1).
case_images: Radiology findings: Axial (A) and coronal (B) slices of CT urography in excretory phase at the level of the left kidney demonstrate extensive urothelial thickening (*) of the left renal pelvis and proximal ureter (not shown) with subtle nodular filling defects (arrowheads).
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case_images: PMC11783206_01_gr2.jpg
case_images: fig0002
case_images: The collecting system showed stable extensive urothelial thickening of the left renal pelvis and proximal ureter that demonstrated subtle nodularity, consistent with the previous diagnosis of polypoid pyelitis with urethritis (Fig. 2).