“…All have found that the chances of spontaneous cure were greatest in the minor degrees, as would be expected. A representative report is that of Heikel & Parkkulainen (1966) (Table 3): they found no improvement in their Group 5, the most severe cases, cure in 27 % of the series and improvement in 17%. It would then be generally agreed that the severely dilated refluxing ureters are unlikely to get better of their own accord, although this group, of course, includes those who are most difficult to manage by surgical treatment.…”