In 2007 I had a scan for a hematoma that revealed what the dr. called a "small" cyst on my kidney, nothing to worry about. I find out now it was 8cm and as of an ultrasound in October 2009 it is not 10.9 cm, or as she stated, "the size of a can of coke. Can anyone tell me what tests should be performed, possibility of cancer, need for removal, etc. The only "medical problems" that I have is diarhea, only after I eat lunch, and a horrendous pain just below my sternum in the middle of the night that occurs about 2-3 times per month. I am wondering if my digestive tract is being compromised by such a large cyst. Any thoughts from anyone would be very helpful. Thanks!