There are two major categories of kidney tumors: benign and malignant.
Benign tumors mainly include:
- Renal vascular smooth muscle lipoma (malignant tumor);
- Renal cortical adenoma;
- paraglomerular cell tumors;
- Fibromas;
- smooth muscle tumors, etc.
Malignant tumors mainly include:
- Renal cell carcinoma and pelvic uroepithelial carcinoma originating from epithelial tissues;
- Fibrosarcoma, liposarcoma, smooth muscle sarcoma, and rhabdomyosarcoma originating from mesenchymal tissue;
- Nephroblastoma and embryonal carcinoma originating from embryonic tissues.
A large number of data show that renal malignancies account for 96% to 98% of all renal tumors, and among renal malignancies, renal cancer predominates, accounting for about 90%, with pelvic cancer being the most common among the remaining 10%. Some benign tumors are difficult to distinguish from malignant tumors and require the diagnosis and treatment of an experienced oncologist.