1982 Volume 73 Issue 11 Pages 1395-1401
We have analyzed the cases of urolithiasis at the Department of Urology, School of Medicine, Chiba University since 1965 through 1980 in order to obtain a clue for the future policy of the treatment of urolithiasis as well as to prevent recurrence of it.
1) Out of 42633 new patients, urolithiasis counted 5.3%, and recurrent calculus diseases were seen in 12.6% of them.
2) The ratio of male patients to female patients was 2.1 to 1. In upper urinary tract calculus patients, thirties were most frequent and twenties together with fourties followed them. The age of the patients with recurrent calculi were 10 years older than that of primary calculi. As for lower urinary tract calculi, about half the patients were older than 60 years old.
3) Analysis of the component of the calculus revealed that the percentage of calcium oxalate mixed with calcium phosphate was 47%, and that of calcium oxalate was 25%. Calculi containing phosphate were seen in 47% of female patients.
4) In patients with small calculi less than 9×6mm, 90% of them became stone free within 4 months.
