Some friends often find misshapen tumor in kidney during physical examination and ask how to treat it? In fact, because renal malformation tumor (also called vascular smooth muscle lipoma) is a relatively common benign tumor of the kidney, small malformation tumor may not affect the body, but larger malformation tumor can be secondary to rupture and bleeding or even life-threatening, so whether the renal malformation tumor should be treated surgically is generally based on its size or whether it causes clinical symptoms, there is no clinical consensus, but in general, less than However, in general, malformation tumors less than 4 cm in diameter generally do not need treatment, but should be reviewed every six months, and if they are growing faster or larger than 4 cm, tumor resection, nephrectomy or interventional embolization should be considered. In addition, sometimes it is difficult to distinguish renal malformation tumor from renal cancer by ultrasound examination, but CT examination can usually confirm the diagnosis.