Course Map: Tumor-like Lesions: Papillary/Polypoid Cystitis

Papillary/Polypoid Cystitis
Inflammatory lesions of the lamina propria, particularly when accompanied by much edema, will produce an irregular mucosal contour with broad-based or club-shaped surface projections (polypoid cystitis, Fig. 1). Sometimes, there will be a pronounced hyperplasia of the urothelium with resulting exophytic excrescences resembling papillary neoplasms. This is shown in Figure 2 which is near a bladder fistula. More often the surface protrusions will include both broad-based and narrow structures, so polypoid and papillary cystitis are descriptive designations for a single entity. Figures 3 and 4 show this variation. The delicate fibrovascular cores of true neoplastic fronds are not present. [119].
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	Figure 1: Polypoid cystitis.
	Figure 2: Marked epithelial hyperplasia around a fistula includes, also, some papillary excrescences resembling a papillary tumor (arrows).
	Figure 3: Polypoid (arrow) and papillary cystitis (arrowheads).
	Figure 4: Polypoid cystitis. These projections do not have the fibrovascular cores of neoplastic fronds.