Renal stones are solid crystalline aggregates formed in the urinary tract due to supersaturation of urine with minerals.   Types • Calcium oxalate stones • Uric acid stones • Phosphate stones • Struvite stones   Diagnosis • Urinalysis • Non-contrast CT scan • Renal ultrasound   Prevention • Adequate hydration • Dietary salt restriction • Reduced animal protein intake Rosa Nashat Al-Mustaqbal University The First University in Iraq.