AKT-0579
A 6-year-old boy comes to his General Practitioner with his mother and stepfather. He has a 2-month history of intermittent abdominal pain. The pain is colicky in nature and periumbilical. His appetite is slightly reduced. He is not constipated. The pain is causing him to miss some school, but he also experiences it at the weekend. The patient is otherwise normal and his height and weight are on the 50th centile.
What is the most likely diagnosis?