Functional and Targeted Lymph Node Imaging in Prostate Cancer: Current Status and Future Challenges.

Area of Science:

• Oncology
• Radiology
• Medical Imaging

Background:

• Prostate cancer patients with lymph node (LN) metastases require aggressive treatment due to increased mortality risk.
• Surgical LN dissection is standard for staging but is invasive and associated with significant morbidity.
• A noninvasive imaging method is needed to reduce or replace extended pelvic LN dissections (ePLND).

Purpose of the Study:

• To review novel functional and targeted imaging techniques for improved lymph node staging in prostate cancer.
• To discuss the strengths and limitations of these emerging imaging modalities.

Main Methods:

• Review of current literature on advanced imaging techniques for prostate cancer lymph node staging.
• Discussion of functional MR imaging (e.g., diffusion-weighted MR imaging), MR lymphography, and positron emission tomography (PET) imaging.

Main Results:

• Conventional CT and MR imaging are insensitive and nonspecific for LN staging due to reliance on inaccurate size criteria.
• Novel techniques like diffusion-weighted MR imaging, MR lymphography, and targeted PET imaging show promise for improved LN staging.
• Despite advancements, current imaging techniques cannot yet replace extended pelvic lymph node dissection (ePLND).

Conclusions:

• Advanced imaging techniques offer potential for noninvasive staging of prostate cancer lymph nodes.
• Further development is needed before these novel methods can replace conventional surgical staging.
• Improved imaging could reduce the need for invasive procedures like ePLND, minimizing patient morbidity.