A 10 month old comes to the ED with his mother with concern for dehydration. Mom states he has 2 brothers at home with diarrhea and vomiting recently, and she thinks this child caught the same bug. The child is actually quite sleepy on exam, even bordering on lethargic. As you are talking to mom, he begins to scream and flex his hips. Mom says he has been doing this today, screaming for awhile and then having periods of quiet. During this episode, you obtain the above ultrasound of the abdomen. What do you see? What is the treatment of this condition? What is the role of Ultrasound in diagnosis?