The evolution of the classification of neoplasms of the urinary passages has changed greatly since Friedman and Ash published the first series AFIP fascicle on the urinary bladder in 1959. Today the classification continues to accrue entities based upon morphology, immunophenotype, and compelling clinical associations. This comprehensive, detailed, and lushly illustrated fascicle is a remarkable resource to surgical pathologists and other specialists who treat patients with tumors of these sites.