How reliable are imaging techniques in aging males with bladder cancer?

Area of Science:

• Urology
• Oncology
• Radiology

Background:

• Accurate lymph node staging is crucial for bladder cancer prognosis.
• Open radical cystectomy and pelvic lymph node dissection are standard treatments.
• Preoperative imaging consistency with pathological findings is key for treatment planning.

Purpose of the Study:

• To evaluate the consistency between clinical and pathological lymph node positivity in bladder cancer patients.
• To compare the diagnostic performance of computed tomography (CT) and magnetic resonance imaging (MRI) in detecting lymph node metastasis.
• To assess the reliability of imaging modalities for guiding surgical decisions.

Main Methods:

• Retrospective analysis of 135 patients undergoing open radical cystectomy.
• Inclusion of patients with clear preoperative contrast-enhanced abdominopelvic CT or MRI.
• Recording and comparison of positive clinical lymph nodes (radiological) and pathological lymph nodes.

Main Results:

• MRI demonstrated higher sensitivity (50%) and positive predictive value (100%) compared to CT (25.81% sensitivity, 66.67% PPV).
• Both CT and MRI showed high specificity (CT: 95.45%, MRI: 100%) and accuracy (CT: 77.31%, MRI: 81.25%).
• No significant difference was found in sensitivity, specificity, NPV, or accuracy between CT and MRI, but PPV was significantly higher for MRI.

Conclusions:

• Contrast-enhanced CT and MRI have low sensitivity for lymph node detection in bladder cancer.
• MRI appears to be a more reliable imaging modality than CT for lymph node assessment in this patient group.
• Improved lymph node detection accuracy can impact patient prognosis and treatment strategies.