Dear Editor, Renal cell carcinoma (RCC) accounts for 2% to 3% of all adult malignancies and the incidence of cutaneous metastasis from this tumor is 2.8% to 6.8%.1 RCC with sarcomatoid differentiation is a highly aggressive form of RCC. 3 Peris K, Fargnoli MC, Lunghi F, Chimenti S. Unusually large cutaneous metastases of renal cell carcinoma.