Characterized by inflammatory infiltrates rich in eosinophils.
Occurs in patients of wide age range and is more common in females.
Three clinical settings:
Localized and non-specific reaction to bladder injury, such as transurethral resection procedure or invasive carcinoma.
Less often, in setting of allergy in which patients may also have asthma, allergic gastroenteritis or peripheral blood eosinophilia.
Rarely in parasitic infestation.
Inflammatory infiltrates composed predominantly of eosinophils in lamina propria &/or muscularis propria (image A) & (image B).