Small distal left ureteric stone - the commonest site for an obstructing ureteric stone.

Less than 5mm stones typically are treated conservatively and pass spontaneously.

If dense on plain radiograph or scanogram of a CT-KUB follow up with plain radiograph imaging is sufficient.

It is good practice when reporting a stone on CT-KUB to inform the referrer if it is visible on plain radiograph for follow up purposes.