Patient: In early November 2008, he was found to have hydronephrosis in his left kidney by physical examination and 6.5*4.3 occupancy in his left kidney by enhanced CT examination, which was highly suspected to be diagnosed as kidney cancer, but the patient did not have any clinical symptoms of kidney cancer. on December 2, 2008, he underwent radical left nephrectomy in the Department of Urology of Henan Provincial People’s Hospital. The hospital informed that there was no follow-up treatment and now recuperating at home. Laboratory and examination results: postoperative immunohistochemical pathology diagnosed as left renal vascular smooth muscle lipoma. There were also 3mm stones in the right kidney by preoperative ultrasound. The patient had high uric acid measured 4 years ago, but had no gout symptoms. Doctor: Most of the angiosmooth muscle lipomas are benign, but very few of them can be malignant. Pay attention to regular whole-body physical examination. After surgery, the main attention should be paid to protect isolated kidney function, low-salt diet, cautious use of drugs with renal function impairment, high protein diet should be controlled, especially bean-based mouth, but should be appropriate into high-quality protein, such as refined meat.