<qa>  What is a common condition caused by stones in the kidney and ureter?Renal colic is a common 1300 visits per year at our institution and painful condition caused by stones in the kidney and ureter, and can be mimicked by life threatening conditions such as a ruptured abdominal aortic aneurysm AAA. This can create clinical uncertainty. Emergency department targeted ultrasound EDTU is performed by an emergency physician at the patients bedside, and has been shown to be accurate, safe, and efficient. We have shown that EDTU can accurately identify hydronephrosis, which is a predictor of complications of kidney stones. A normal formal ultrasound US predicts an uncomplicated clinical course. We will assess the accuracy of EDTU for the diagnosis of hydronephrosis, and when normal, whether patients can be safely discharged. 