What are urinary stones?

Crystals and protein matrix, 4 steps to form (supersaturation, nucleation, aggregation, crystal retention) Gall stones is a very frequent pathology, 5-10% of general population, age 20-60 male:female 3:1 tripled incindence at age 40, very frequent recurrence (more than 60% over 10 years) Targets mostly high UT (pyelocaliceal cavirties/ureters) but also in bladder sometimes Multidisciplinary tx.