Prostate with tiny calcification (unlikely to be cause of symtoms), rectum

Bladder with tiny calcification in distal ureter (most likely cause of symptoms, with obstruction at the UVJ), seminal vesicles

Dilated right renal calyces due to obstruction, with tiny calcifications in lower pole of kidney (unlikely to be cause of symptoms), IVC and aorta

When looking for tiny stones on CT, it is best not to give any white material (like oral or IV contrast) that might obscure the stones.