Case records of the Massachusetts General Hospital. Case 11-2013. A 4-year-old boy with fever and abdominal pain.

From the Departments of Pediatric Surgery (D.P.R.), Pediatrics (A.M.F.), Radiology (M.D.S.), and Pathology (R.J.H.R.), Massachusetts General Hospital; and the Departments of Surgery (D.P.R.), Pediatrics (A.M.F.), Radiology (M.D.S.), and Pathology (R.J.H.R.), Harvard Medical School — both in Boston.