Ureterolithiasis is rare in children. Although ureterorenoscopy is nee
ded only in few cases, because of the small number of children who suf
fer from ureteral stones, the development of small-calibre semi-flexib
le instruments for the treatment of any ureteral stones can be seen as
a useful extension of the range of therapeutic options. The establish
ed technique used in adults can also be applied in children. It is rec
ommended that endoscopic stone treatment should be carried out in chil
dren only by operators who can draw on a wide experience of such proce
dures in adults. The small-calibre instruments must be used and extrem
e caution is still required. We report on our experience with ureteror
enoscopy in 12 children.