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A retrospective analysis of 41 patients treated for metastatic inguinal lymph node malignant melanoma is presented: 16 underwent inguinal node excision and 25 ilioinguinal node excision. The two groups were well matched for age, sex and other characteristics. The mean time in hospital (inguinal 20 days, ilioinguinal 18 days) and the complication rates (inguinal, ten of 16 patients, ilioinguinal, 13 of 25) were similar in each group. The incidence of groin relapse, defined as the development of symptomatic melanoma in the region of the inguinal or iliac node basins following block dissection, was lower after ilioinguinal block dissection (inguinal, three patients; ilioinguinal, none). Histological examination demonstrated a high proportion of iliac node involvement (13 of 25 patients), even in those with a single mobile inguinal lymph node clinically and no clinical or computed tomographic evidence of iliac node involvement. This supports the value of ilioinguinal block dissection and suggests that the associated morbidity need not be greater than that associated with inguinal clearance alone.

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