Sarcomatoid renal cell carcinoma is rare in renal cell carcinoma. Preoperative accurate determination of renal cell carcinoma is helpful for determining the extent of surgical resection. Surgical resection of renal sarcomatoid carcinoma requires extensive surgical scope and due to its tendency. For metastasis, metastatic lesions need to be evaluated before surgery. Therefore, enhancing the understanding of renal sarcomatoid carcinoma by the sonographer is of great significance for its treatment.#$NL 【Keywords】 Contrast-enhanced ultrasonography; Renal sarcomatoid carcinoma