I have now joined the ranks of all of those who have suffered from this affliction. When I worked in the ER, everyone who had these had my sympathy, now they have my deepest sense of empathy. Found out I have four of them last week 1mm to 4mm in size. I've had pain on two occasions bad, otherwise kind of an ache like I got punched there. Also found out I have a "mass" or "complex cyst" on one kidney. Trying to figure out what it might be, and probably "we'll just watch it". They also want to do a cystoscopy on me next week, and I'm not very excited about that.