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→Bladder cancer: Edema
File:Papillary urothelial carcinoma (low-grade), very high mag.jpg|'''Low grade [[urothelial carcinoma]]''': Urothelium is thickened but only slightly atypical and has maintained polarity.
File:Papillary urothelial carcinoma (high-grade), very high mag.jpg|'''High grade [[urothelial carcinoma]]''': Loss of polarity and severe abnormal cytology.
File:Histopathology of inverted urothelial papilloma, high magnification.jpg|In contrast, an '''inverted urothelial papilloma''' has smooth surface with minimal to absent exophytic component, is well circumscribed with smooth base, and has no obvious infiltration and no/minimal cytologic atypia.<ref>{{cite web|url=https://www.pathologyoutlines.com/topic/bladderinvertedpapilloma.html|title=Bladder, ureter & renal pelvis - Urothelial neoplasms - noninvasive - Inverted urothelial papilloma|website=Pathology Outlines|author=Monika Roychowdhury}} Topic Completed: 1 December 2014. Minor changes: 3 December 2020</ref>
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Other possibilities:
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File:Histopathology of squamous cell carcinoma of the urinary bladder, low magnification.jpg|'''Squamous cell carcinoma ''' of the urinary bladder. {{further|Urothelial versus squamous cell carcinoma|linebreak=no}}File:Histopathology of radiation cystitis.jpg|'''Radiation cystitis''' with atypical stromal cells (“radiation fibroblasts”), edema and inflammation. Check whether the patient has received radiation before making the diagnosis.File:Histopathology of non-specific urothelial edema.jpg|'''Edema''' (clear spaces of both the lamina propria and cytoplasm of multiple urothelial cells), which is non-specific.
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