Urolithiasis is a condition that occurs when these stones exit the renal pelvis and move into the remainder of the urinary collecting system, which includes the ureters, bladder, and urethra.Watch this video to learn more about it. 0:00 What are kidney stones? 0:57 Basic anatomy 1:37 Pathophysiology 3:20 Causes 6:50 Types of stones 9:20 Signs and symptoms 12:57 Complications 14:00 Diagnosis 15:09 Management