Lymphoscintigraphy of the Lower Extremities: Discrepancies Between Superficial and Deep Lymphatic Systems

Area of Science:

• Urology
• Medical Imaging
• Lymphatic System Research

Background:

• Radical prostatectomy and pelvic lymphadenectomy are standard treatments for prostate cancer.
• Post-operative lymphedema can occur following lymph node dissection.
• Lymphoscintigraphy is a diagnostic tool for evaluating lymphatic system abnormalities.

Observation:

• A 57-year-old male patient presented with bilateral lower extremity swelling two years after prostate cancer surgery.
• Lymphoscintigraphy demonstrated superficial dermal backflow in the right hypogastrium and deep lymphatic reflux in the left hypogastrium.
• A discrepancy was noted between superficial and deep lymphatic system findings in the lower limbs.

Findings:

• The observed asymmetric lymphatic drainage patterns (dermal backflow and deep reflux) were attributed to the surgical procedure.
• Asymmetric sampling of pelvic lymph nodes during lymphadenectomy is the likely cause of the differential lymphatic system findings.
• This case highlights a potential consequence of pelvic lymphadenectomy on lymphatic circulation.

Implications:

• Understanding asymmetric lymphatic drainage is crucial for diagnosing and managing post-operative lymphedema.
• Lymphoscintigraphy can reveal subtle lymphatic abnormalities following pelvic surgery.
• This case underscores the importance of considering surgical technique when interpreting lymphatic imaging studies in prostate cancer patients.