cm are larger than mm!!!!!!!! My daughter had a CT and then ultrasound as had unexplained pain in the general kidney area. We were told her kidneys were polycystic (lots of them) but the doctor was not at all concerned, I was really worried hearing this as I have kidney disease. however mine is a structural defect, no bladder, so not genetic. Just hope the doc is right!!!! Her pain settled though quite quickly anyway. I think everyone should know their egfr though, thats what kidny health australia says anyway. if normal they suggest is still checked as part of your yearly medical check up
Oh, I read my report again and it said that the cyst was 4.4cm not mm. 4.4 mm is pretty small. :)
Therapy for a cyst in the kidney is based on the size and the pressure symptoms it is causing. So, a regular follow up is necessary to monitor its growth. Also, renal function tests may help assess the functioning of the kidneys.
Hope this helped and do keep us posted.