What does left kidney duplication mean?

What does left kidney mean? The so-called double kidney refers to two kidneys on one side. This is not really two kidneys, but one kidney consists of two parts. One is called the upper kidney, and the other is called the lower kidney. Each of the two parts has its own ureter and renal pelvis. The incidence of double kidney is relatively rare. The incidence is about 7‰. It is a relatively rare abnormality of our urinary system. Duplication of kidney, if there are no obvious clinical symptoms. only we found it during physical examination, we can check it regularly. If it shows severe hydronephrosis of kidney, or shows symptoms of infection, fever, low back pain, and we need surgery.