Background : Urinary bladder cancer is one of the most common tumors among the lower urinary tract , computed tomography urography (CTU) is noninvasive technique to used to detect urinary tract lesions and it consist of unenhanced phase . nephrographic phase and excretory phase. Corticomedullary phase may be added to role out urinary bladder lesions.

Aims: This study aims to examine of correlation of adding corticomedullary phase and sensitivity of detection of urinary bladder cancer .

Patient and methods : This is a prospective study conducted on 25 urinary bladder cancer patients from department of the radiology, Minia Oncology Center from December 2022 to January 2024 .

Results: Enhancement of corticomedullary phase were significantly higher than other phases (unenhanced phase , nephrogenic phase, excretory phase) .

Conclusion : By adding corticomedullary phase to computed tomography urography (CTU) can detect urinary bladder lesions with high accuracy even with negative CTU .