I am a 51 year old Filipino male, my height is 5ft 5in, weight is 140lbs, upon advise of my doctor I had an ultrasound made, the result of which shows that my left kidney is 11.28 x 5.64 x 4.41 cm with a cortical thickness of 1.39cm. It has a cortical cysts measuring 1.6 x 1.6 cm and 1.3 x 0.8cm in its mid and upper pole. no calculus or caliectasis noted. What the report mean and what should be done?