A 68-year-old man presents with progressive fatigue and dyspnea on exertion over 4 months. Laboratory studies reveal hemoglobin 8.2 g/dL, MCV 72 fL, serum ferritin 12 ng/mL, and transferrin saturation 18%. Colonoscopy reveals the lesion marked **B** in the diagram — a polypoid, exophytic mass in the cecum with biopsy-confirmed adenocarcinoma. Which of the following best explains why iron-deficiency anemia is the presenting feature of right-sided colonic adenocarcinoma rather than acute obstruction?
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