Benign tumors of the kidney can originate from any tissue of the kidney, including renal tubules, smooth muscle, fat, blood vessels and renal peritoneum. These tumors have no malignant biological behavior in clinical presentation and are most often seen for clinical symptoms or bleeding due to an increase in tumor size. Benign renal tumors are very common in clinical practice, and the two most common ones are simple renal cysts and vascular smooth muscle lipomas. What are benign renal tumors? 1.Benign cyst of kidney. 2.Adenoma of the kidney. 3.Eosinophilic tumor of the kidney. 4.Renal vascular smooth muscle lipoma. 5.Smooth muscle tumor. 6, reninoma (paraglomerular cell tumor). 7, posterior renal tissue adenoma. 8.Mixed epithelial mesenchymal tumors of the kidney. Cystic nephroma. How to confirm the diagnosis of benign renal tumor? All benign renal tumors have characteristic manifestations in imaging and are relatively easy to diagnose. In addition, about 10% of tumors suspected to be renal cancer are eventually confirmed to be benign. In recent years, the detection rate of small renal tumors has increased due to the widespread use of ultrasound and CT in asymptomatic people, and consequently the detection rate of benign renal tumors has also increased.