Risk factors for lower extremity lymphedema after inguinal lymphadenectomy in melanoma patients: A retrospective cohort study.

Background: The aim of lymph node dissection for melanoma patients is to prevent metastasis. However, this procedure is accompanied by a long-term and impaired life-quality complication called Materials and Methods: We identified 136 inguinal lymphadenectomy melanoma patients treated between January 2010 and January 2021. The patients' demographic, clinical, and pathological data and postoperative outcomes were collected by electronic medical record review and patient follow-up. The patients' postoperative outcomes were defined as lower extremity swelling and lower extremity lymphedema. Univariate and multivariate analyses were used to determine the independent predictors of lower extremity lymphedema. Results: The follow-up results from 85 melanoma patients who underwent inguinal lymphadenectomy were analyzed. Multivariate logistic regression analysis showed that number of lymph nodes removed ≥ 10 was the significant risk factor for postoperative lower extremity lymphedema (odds ratio = 6.468, P = .042, 95% confidence interval: 1.069 to 39.147). Moreover, 8 (100%) patients in the lower extremity lymphedema group and 32 (53.3%) patients in the normal group were female, which indicated that female patients might be more susceptible to postoperative lower extremity lymphedema (P = .012). Conclusion: Our study found that number of inguinal lymph nodes removed ≥ 10 was associated with a significantly higher incidence of lower extremity lymphedema with a 6.5-fold increased risk in melanoma patients. Also, female patients were more likely to develop lower extremity lymphedema after inguinal lymphadenectomy.