MR staging of bladder carcinoma: correlation with pathologic findings

Area of Science:

• Urologic oncology
• Diagnostic imaging
• Radiology

Background:

• Bladder carcinoma staging is critical for treatment planning.
• Accurate preoperative assessment of tumor extent is essential for surgical success.

Purpose of the Study:

• To evaluate the accuracy of magnetic resonance (MR) imaging in staging bladder carcinoma.
• To compare MR imaging with surgical and pathological findings.

Main Methods:

• Forty patients with bladder carcinoma underwent preoperative MR imaging.
• Surgical and pathological findings were correlated with MR imaging results.
• Tumor staging was assessed using the TNM classification.

Main Results:

• MR imaging demonstrated high sensitivity (95%) and specificity (95%) for deep muscle wall invasion.
• It showed high specificity (100%) but lower sensitivity (66%) for perivesical fat involvement.
• Accuracy for staging bladder carcinoma was 60%, with overestimation in 7.5% and underestimation in 32.5% of cases.
• MR imaging proved superior to CT in detecting invasion of adjacent organs.

Conclusions:

• MR imaging is accurate for identifying deep muscle and lymph node involvement in bladder cancer.
• It is comparable to CT for perivesical fat assessment and superior for adjacent organ invasion detection.
• Limitations exist in evaluating tumor extension into periurethral glands.