Cystitis cystica (cystosis) with bladder cancer.

The term cystitis cystica is a misnomer and reflects the unfortunate habit of labeling obscure bladder conditions as cystitis. Cystosis of the bladder would be a more correct term. Cystitis cystica is a derivative of the focal epithelial proliferation, the associated tumors tend to be non-infiltrating papillary and the prognosis is good.