Altered lymphatic drainage following lymphadenectomy

Area of Science:

• Nuclear medicine
• Oncology
• Surgical oncology

Background:

• Assessing lymphatic drainage is crucial for staging and treatment planning in malignant melanoma.
• Understanding lymphatic system changes post-surgery is vital for predicting recurrence and guiding further management.

Purpose of the Study:

• To evaluate changes in lymphatic drainage patterns before and after lymphadenectomy in patients with trunk melanoma.
• To determine the temporal dynamics of lymphatic channel alterations following surgical intervention.

Main Methods:

• Utilized radionucleotide scanning with colloidal gold-198 (198Au) and technetium-99m sulfur colloid.
• Performed tomographic scanning after intradermal injection around the primary melanoma site to identify regional lymph nodes.
• Rescanned patients approximately one year post-lymphadenectomy to assess changes in lymphatic drainage.

Main Results:

• Eight out of ten patients exhibited altered postoperative lymphatic drainage patterns compared to preoperative scans.
• Three patients showed no drainage to the lymphadenectomy site; two had partial drainage to the site plus new drainage routes.
• One patient had drainage to only one of two preoperative sites; two had no identifiable postoperative drainage.

Conclusions:

• Surgical interruption of lymphatic channels is generally temporary.
• New lymphatic drainage pathways, potentially different from preoperative routes, typically develop within one to two years after lymphadenectomy.