Question: A 12-year-old boy presented with a history of iron deficiency anemia for which he had taken oral iron supplementation for 2 years. He also complained of intermittent right hip pain in recent years. He had no weight loss, no prolonged fever or abdominal pain, and had regular bowel movements, except for dark-colored stool at times. He was referred to our pediatric clinic because his stool was guaiac positive, where his hemoglobin level was 6.6 g/dL and platelet count, blood clotting time, C-reactive protein level, and urinalysis results were normal.