0 mm (small one) that stayed lodged in my kidney for 2 yrs playing havoc with pain and
then one day it decided to let loose and
it was less than what I went through on/off for 2yrs. Then I had a 1.0mm one that got stuck very low and
caused renal colic for over a week and
the CT Scan showed it was very low and
finally it passed
, too. But yours may be stuck as the Dr above mentioned so I'd go for re eval. I went ev. 6mos for new tests.