<s>[INST] I have had kidney stones for 22yrs several surgeries last one was just this dec 3 stones blocking urether they were crushed and had j stent in. j stent was removed dec 19th on dec 27th i had gone for a MRI for lumbar spine and report did show back problems but also read: the visualized surrounding intra-abdominal and pelvic structures demonstrate probable right renal cysts, one of which measures at least 13mm although assessment is limitied due to mortion artifact. PLS TELL ME WHAT THIS MEANS. i did speak to my urologist and he said he was not concerned as i have had several cat scans [/INST] Good Day, and thank you for being with Chat Doctor ! Simple renal cysts are benign conditions that doesn't cause any pain and it doesn't become cancer. Increase in size of renal cyst usually grows less than 1 mm per year. Ct scan and ultrasound has a greater sensitivity to detect renal cyst that is why your urologist told you he is not concerned.  I hope I have succeeded in providing the information you were looking for. Please feel free to write back to me for any further clarifications at: http://www.ChatDoctor .com/doctors/ Chat Doctor.  Best wishes </s>