The cyst in the right kidney is actually just a unilateral cyst in the kidney, and this cyst is a simple benign renal cyst. This kind of cyst originates from renal tubular diverticulum, which is a cystic structure formed by the expansion of renal tubular diverticulum, a dense chamber filled with fluid. The number of cysts is usually small, either in one kidney or in both kidneys, but the overall number is usually small. These cysts grow very slowly and are usually very unlikely to affect kidney function. Because they are benign, cysts do not require special treatment when they are small, but if they are more than five centimeters in diameter, you can consider ultra to perform puncture and aspiration and inject sclerosing agent into the cyst to shrink the cyst.