The pathological types of renal tumors are complex, with specific clinical manifestations, and varying views. Since N.C. Foot et al. proposed to divide renal tumors into five categories of renal parenchymal cell tumors, renal migratory cell tumors, renal embryonal carcinomas, renal mesenchymal tumors, and secondary renal tumors in 1951, this classification has been accepted by the public with its simplicity, comparative perfection, and practicality. In recent decades, people's understanding of renal tumors has been greatly changed, such as in the past, almost all renal tumors were considered malignant and very few benign, but now the benign tumors accounted for a considerable proportion and are not rare; uroepithelial tumors in the upper and lower urinary tracts are interconnected, and they should be treated as a specialized diagnostic and therapeutic system, etc. These advances have also been reflected in the classification of renal tumors. These advances are also reflected in the classification of tumors. In 1981, WHO classified renal tumors into eight categories according to their tissue origin: 1, epithelial tumors of renal parenchyma, A adenomas, B carcinomas renal cell carcinomas Others. 2, epithelial tumors of renal pelvis A migratory cell papillomas B migratory cell papillary carcinomas C squamous carcinomas D adenocarcinomas F undifferentiated carcinomas. 3, embryonic renal carcinomas A nephroblastomas B mesodermal tumors C multicystic nephroid tumors. 4, non-epithelial tumors A benign: a vascular smooth muscle Lipoma (malignant tumor). Fibrous tumor. B malignant. 5. B malignant. 5. Mixed tumors A paraglomerular cell tumors. B other. 7. Unclassified tumors. 8. Neoplastic lesions A residual renal embryonic tissue. B massive renal embryonic tissue. C renal dysplasia. D vascular malformations. E cysts. F renal tubular hyperplasia. G yellow granulomas. H chondromatosis. Other. This classification takes into account the pathologic, clinical, and prognostic characteristics of various types of tumors, and we adopt this classification. Because renal carcinoma accounts for about 85% of primary renal malignant tumors, the clinical term renal malignant tumors mainly refers to renal carcinoma. In recent years, some renal eosinophilic cell tumors are found to be metastatic, and some scholars believe that they are low-grade malignant renal cancers.