Theme — Lymphatic Regeneration & Mechanism
Why would drainage reroute to the contralateral side at all? Candidate mechanisms below.
Papers
- Kwon et al - Lymphatic Contractility and Drainage After Lymphadenectomy (Mouse Model) — collateral vessel recruitment + restored contractility by day 13, not new node formation (see correction in Fact-Check Log)
- Yan et al - Mechanisms of Lymphatic Regeneration After Tissue Transfer
- Heydon-White et al - ICG Lymphography for Breast Lymphoedema — ICG can visualise altered drainage pathways in vivo
- Kim et al 2023 - Accessory Lymphatic Drainage Pathways — now fully verified; 17.9% of patients form accessory pathways after axillary disruption, with significantly less limb swelling. Explicitly poses the same unresolved question as Kwon et al.: true lymphangiogenesis vs dilatation of pre-existing collaterals. Surfaced two further leads not yet in the vault — Tashiro et al. 2016/2017 (Ann Plast Surg) on ICG-visualised collateral formation in upper/lower limb lymphedema, and Mihara et al. 2013 (the only one of the four with histochemical, not just imaging, proof of new lymphatic growth).
Working hypothesis for the Discussion
Obstruction/removal of the ipsilateral pathway (surgery, radiotherapy, tumour involvement) → increased intraluminal pressure → co-opting of pre-existing collateral vessels → contralateral drainage. Supported piecemeal across Sato et al - Altered Lymphatic Drainage Patterns in Re-SLNB (Radiotherapy Effect), Kwon et al - Lymphatic Contractility and Drainage After Lymphadenectomy (Mouse Model) and Jitworawisut and Tsukuura - Letter on Intraluminal Pressure Hypothesis — no single paper proves the full chain in melanoma specifically.