Whether a kidney cyst needs to be removed depends on the size of the cyst and whether it is accompanied by other symptoms. Most of the simple renal cysts are less than 2cm in diameter, patients usually have no symptoms, and can be reviewed regularly; when the diameter of the cyst reaches 4cm, patients will often cause symptoms, and surgery is feasible according to the doctor’s advice. 1. benign renal cysts may be congenital genetic formation, when the diameter of renal cysts is less than 2cm, in this case, patients usually have no symptoms, and the local cysts will not grow larger, so you can first be actively observed, there is no need for surgical removal. 2. Benign kidney cysts may grow gradually, and under the stimulation of some factors, malignant changes may occur, resulting in abnormal kidney function, causing hematuria, edema, proteinuria and other abnormal symptoms, which will require timely surgical removal of diseased tissues. Benign kidney cysts are relatively common nowadays and may be found when doing ultrasound examination of kidney. Once kidney cysts appear, it is better to have regular review every year, and if there is any change or cause abnormal symptoms, you should seek medical treatment in time.