An 11-year-old boy presents with acute central abdominal pain for five hours. A short while before the onset of symptoms, he had sustained minimal blunt trauma to the same area when playing with his friends.

He also complains of pruritus all over his body, particularly the limbs and trunk, which started soon after the injury. His medical, surgical, and family histories are unremarkable. His family migrated from Kenya around 2 years ago.