Liam, an 8-month-old male infant, is brought to the emergency room by his parents due to intermittent episodes of crying and drawing his legs to his chest over the past 24 hours. The episodes last for about 10 minutes, during which Liam appears extremely uncomfortable, followed by periods of lethargy. The parents report one instance of bloody, mucus-filled stool described as “currant jelly.” On examination, Liam has a distended abdomen and a palpable “sausage-shaped mass” in the right upper quadrant. An ultrasound reveals a “donut sign” in the ileocecal region. What is the most common location for this disorder in children?
