Final answer:
The described symptoms suggest the diagnosis of intussusception, which is confirmed by ultrasound and treated by air or barium enema or surgery if needed.
Step-by-step explanation:
The symptoms described in the question, including colicky abdominal pain, currant jelly stool, and a sausage-shaped mass in the right upper quadrant (RUQ) are indicative of intussusception. This is a condition where a part of the intestine telescopes into an adjacent part of the intestine, often leading to obstruction. The presenting symptoms are classic for this condition, especially in infants and young children.
The diagnosis of intussusception is typically confirmed with an abdominal ultrasound, which can visualize the telescoped section of the intestine. The treatment for intussusception is usually an air or barium enema, which can often reduce the telescoped segment of bowel non-surgically. If this approach is not successful or if the child is very ill, surgical intervention may be necessary to correct the obstruction.