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Papillary Cystitis

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This is a reactive lesion seen in response to any agent that inflames or injures urothelial mucosa. The urothelial lining may form broad-based polypoid or slender papillary structures that may at first glance mimic urothelial neoplasia. In-dwelling catheters and colovesical fistulas are some of the common causes. This bladder biopsy shows several polypoid and papillary areas. The lamina propria contains dense inflammatory infiltrate.

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