Thanks for your query.You have not mentioned about the shadow whether it is in kidney
or Bladder.and location of a small stone whether it is in ureter
,Kidney or bladder. If the shadow that you have mentioned about is in Bladder it could ne a benign papillary tumor
or carcinoma for which cystoscopic examination and a biopsy
of the mass is mandatory to decide about further treatment.If stone is small and does not have any back pressure changes in kidmy can be observed for a month to pass it out naturally.