This stuff is scaring the crap out of me. I have a 4mm stone that showed on my recent lung, abdominal ct scan and wonder if this will pass. My oncologist just made mention of the stone to me as a secondary result on the ct scan, as i was there for cancer recurance check. Is a 4mm stone considered small, and can I pass it out if I drink a lot of fluids? I don't have any pain from this, and I don't want any from what I am reading here!