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Angiography and arterial stimulation venous sampling. Using arterial stimulation venous sampling, insulinomas (arrows) are seen as well-defined, round or oval vascular blushes that are of increased vascularity compared with the surrounding normal pancreatic parenchyma. | Okabayashi, T., Shima, Y., Sumiyoshi, T., Kozuki, A., Ito, S., Ogawa, Y., … Hanazaki, K. (2013). Diagnosis and management of insulinoma. World Journal of Gastroenterology, 19(6), 829–837. https://doi.org/10.3748/wjg.v19.i6.829

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