Table 2.
Site and size of stones missed on US, the mean size of stones missed was 6.1 mm.
| Stone identified/total | Mean size | |
| Upper ureter | 2/6 (33%) | 6 mm |
| Middle ureter | 9/14 (64%) | 5 mm |
| Distal ureter | 1/2 (50%) | 7 mm |
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