Seroma fluid subsequent to axillary lymph node dissection for breast cancer derives from an accumulation of afferent lymph.
Level 4 - case-series / case-control
Case series with laboratory analysis of biospecimens without a parallel control cohort
PubMed 20298720 · doi:10.1016/j.imlet.2010.03.002
What was done
Seroma fluid was collected at multiple time points (up to 50 days post-surgery) from patients who underwent axillary lymph node dissection for breast cancer. Fluid samples were evaluated via flow cytometry for cellular composition and via biochemical assays for total protein, cytokine (IL-6), and organ-specific protein/enzyme levels in comparison to peripheral blood.
What was found
Seroma fluid contained lymphocytes and mononuclear cells, whereas erythrocytes, platelets, and granulocytes were absent or rare. Median total protein concentration in seroma was 64% of peripheral blood levels. Locoregional tissue-derived markers were elevated relative to blood (ferritin up to 500%, lactate dehydrogenase up to 300%, with exclusive presence of IL-6), whereas distant-organ proteins (e.g., liver-derived ALT, alkaline phosphatase, transferrin, C3, C4; pancreatic amylase and lipase) were reduced. Fluid composition remained stable in individual patients over time points up to 50 days.
Why it matters
This study provides evidence that postoperative seroma is primarily an accumulation of afferent lymph and tissue ultrafiltrate awaiting lymphatic re-anastomosis, rather than a transient acute inflammatory exudate or simple serum leak.
Limits
The abstract does not state the sample size (n), patient selection criteria, or surgical technique variations. Direct in vivo lymphatic tracing was not performed, and quantitative variance measures (confidence intervals or standard deviations) were not reported in the abstract.
Cited by
- supports Lymph fluid rarely contains red blood cells, but often contains white blood cells and cellular waste products.