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Immunostaining of endoglin and CD31 on peritumoral and intratumoral vessels in gastroenteropancreatic neuroendocrine tumors. A: Endoglin staining was limited to angiogenic vessels, whereas CD31 stained both old and new blood vessels in tumor tissue. Magnification 100 ×; B: Representative endoglin staining in a pancreatic neuroendocrine tumor and a gastrointestinal carcinoid metastasis (small bowel mesentery). Magnification 100 ×. Inserts show a higher magnification at 200 ×.
