Bladder cancer: staging with CT and MR imaging.

Area of Science:

• Oncology
• Radiology
• Medical Imaging

Background:

• Accurate staging of bladder cancer is crucial for treatment planning.
• Evaluating extravesical tumor spread is a key challenge in bladder cancer imaging.

Purpose of the Study:

• To compare the diagnostic accuracy of magnetic resonance (MR) imaging and computed tomography (CT) in assessing extravesical spread of bladder cancer.
• To evaluate the ability of MR imaging and CT to assess bladder wall integrity and deep muscle invasion.

Main Methods:

• Retrospective analysis of 30 patients with histologically confirmed bladder cancer.
• Comparison of MR imaging and CT findings against pathological examination for extravesical tumor extension.
• Assessment of bladder wall integrity and muscle invasion using both imaging modalities.

Main Results:

• CT accuracy for extravesical spread was 80% (sensitivity 94%, specificity 62%), while MR imaging accuracy was 73% (sensitivity 82%, specificity 62%).
• Two MR imaging examinations were undiagnostic, considered technical failures.
• MR imaging accurately assessed bladder wall integrity in 28 patients, correlating with pathological findings of deep muscle invasion.

Conclusions:

• CT demonstrated slightly superior accuracy compared to MR imaging in delineating tumors beyond the bladder wall.
• Excluding technical failures, MR imaging and CT showed no significant difference in accuracy for staging bladder cancer.
• Both techniques are valuable for assessing bladder cancer invasion, with CT showing a slight edge in detecting extravesical spread.