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A 55-year-old man was referred to our department for incidental left hydronephrosis diagnosed on ultrasonography. A kidney, ureter, and bladder radiograph showed four calcifications in the left urinary tract: one in the middle ureter (U2) and three in the lower ureter (U3) (Picture 1). A noncontrast-enhanced computed tomography (NCCT) scan revealed that the calcification in U2 was a bone island in the left ilium (Picture 2). For the remaining three calcifications (the stones in U3),doi:10.2169/internalmedicine.52.0401 pmid:23774571 fatcat:d2gk67arvnhfbmoserzx6f6uve