Spontaneous passage of ureteral stone by conservative treatment / 대한비뇨기과학회지

A statistical analysis of 92 patients with ureteral stones, who had been treated by conservative treatment was undertaken to elucidate the correlation between size of calculi and the probability of spontaneous passage. The overall rate of spontaneous passage was 69.5%. Average stone size and treatment duration were 4.0, 5.0, 4.2mm and 9.4, 10, 6.3days in order of upper. mid, lower ureter. The rate of spontaneous passage according to stone size was 80% in less than 5mm. 15% in 5-6mm and 5% in 6-7mm. Therefore, when stones are smaller than 5mm in diameter, higher chances of spontaneous passage would be anticipated in 6-7days.