Cecal Angiodysplasia

A 72-year-old man presents with recurrent painless haematochezia and iron-deficiency anaemia. Colonoscopy reveals multiple small, flat, cherry-red lesions with a fern-like vascular pattern in the cecum and ascending colon, as marked **A** in the diagram. Which of the following best explains the pathophysiological mechanism underlying the formation of this lesion?

A 72-year-old woman with severe aortic stenosis (peak gradient 55 mmHg) and chronic kidney disease presents with 6 months of recurrent obscure overt gastrointestinal bleeding and recurrent iron-deficiency anemia requiring two transfusions. Upper GI endoscopy and small-bowel capsule study were unrevealing. Repeat colonoscopy with careful cecal inspection reveals a small 5 mm flat well-demarcated cherry-red lesion with a fern-like vascular pattern of ectatic vessels in the cecum near the ileocecal valve, as marked **A** in the diagram. This appearance is characteristic of acquired submucosal vascular ectasia (Heyde syndrome suspected). Which of the following is the MOST APPROPRIATE endoscopic treatment for the lesion marked **A**?