Transition zone prostate cancers: features, detection, localization, and staging at endorectal MR imaging

Area of Science:

• Radiology
• Oncology
• Urology

Background:

• Transition zone prostate cancers present unique diagnostic challenges.
• Accurate detection and staging are crucial for effective treatment planning.

Purpose of the Study:

• To evaluate the diagnostic accuracy of endorectal magnetic resonance (MR) imaging for transition zone prostate cancers.
• To assess the ability of MR imaging to perform local staging of these tumors.
• To identify specific MR imaging features associated with transition zone prostate cancers.

Main Methods:

• Retrospective analysis of 148 patients with transition zone prostate cancer and 46 controls who underwent MR imaging before radical prostatectomy.
• Independent review of MR studies by two readers to identify cancer presence, location, and local extent.
• Statistical analyses including receiver operating characteristic and multivariate logistic regression to assess accuracy and identify imaging features.

Main Results:

• Sensitivity and specificity for detecting transition zone cancers ranged from 75-80% and 78-87%, respectively, with fair interreader agreement.
• Detection accuracy increased significantly with larger tumor volumes (P=.001).
• Homogeneous low T2 signal intensity and lenticular shape were significant predictors of transition zone cancer.

Conclusions:

• Endorectal MR imaging is a valuable tool for detecting and localizing transition zone prostate cancers.
• MR imaging aids in the local staging of these tumors.
• Specific imaging characteristics can help differentiate transition zone prostate cancers.