Objective To establish an orthotopic rat model of bladder cancer induced by N-methyl-nitrosourea(MNU) and to evaluate the diagnostic value of CT(computed tomography) scanning in this experimental model.Methods 50 SD rats were randomly divided into the control group(group A) with 15 rats and experimental group(group B) with 35 rats.Each rat of group B was treated with 2 mg MNU per dose every other week,totally 4 doses,by per urethra administration.Meanwhile,each rat of group A was treated with normal saline....