Labels:text | fruit | pomegranate OCR: Resident and Staff Physician Patient Education Chart Stag-Horn Kidney Stones Stag-Horn Calculus & Smaller Stones: * Cause blood in the urine * Obstruct the ureter * Cause calyces and pelvis of the kidneys to become dialated * Causes renal atrophy * 60% to 70% of stones contain calcium * 15% are composed of magnesium and ammonium phosphate * 6% are composed of uric acid Reprinted with permission from Resident and Staff Physician (c) 1991-92, 1993 by Romaine Pierson Publishers, Inc.