A 78-year-old woman with aortic stenosis and chronic kidney disease presents with recurrent iron deficiency anemia and intermittent hematochezia. Upper endoscopy was normal. Repeat colonoscopy with high-definition imaging reveals multiple small lesions in the cecum. The structure marked **A** shows a characteristic morphology with a central feeding vessel and thin radiating ectatic vessels in a fern-like pattern with a surrounding pale halo. What is the most likely diagnosis?
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