Fig. 4

Chronic (a,b) versus acute (c) cystitis (hematoxylin and eosin stain). a Chronic inflammatory cell infiltration composed mainly of lymphocytes and plasmocytes in the lamina propria. The urothelium remains intact (X200, H&E). b Different region of the same case as (a) where mild fibrosis is observed. The arrows point to the active fibroblasts (× 200, H&E). c Acute cystitis. Marked desquamation of the epithelium, hemorrhagic areas and diffuse leukocytic infiltration (mainly lymphocytes and few macrophages in the ulcerative areas). (× 100, H&E)