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Review Question - QID 214597

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QID 214597 (Type "214597" in App Search)
An 18-month-old boy is brought to the emergency department after his parents found a bloody stool in his diaper. They state that overall he has been playful and is tolerating feeds with no vomiting. His parents have noticed maroon-colored stool occasionally in the past, but this one was "more concerning." His temperature is 98.2°F (36.8°C), blood pressure is 98/54 mmHg, pulse is 102/min, and respirations are 22/min. On exam, his abdomen is slightly distended and he exhibits no tenderness to palpation. Laboratory results are shown below:

Hemoglobin: 12.0 g/dL
Hematocrit: 45%
Leukocyte count: 10,200/mm^3 with normal differential
Platelet count: 154,000/mm^3
Heme occult stool testing: Positive
Fecal leukocytes: Negative

Which of the following is the most likely diagnosis?