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[英文释义] A tumor that secretes VASOACTIVE INTESTINAL PEPTIDE,a neuropeptide that causes VASODILATION; relaxation of smooth muscles; watery DIARRHEA; HYPOKALEMIA; and HYPOCHLORHYDRIA. Vipomas,derived from the pancreatic ISLET CELLS,generally are malignant and can secrete other hormones. In most cases,Vipomas are located in the PANCREAS but can be found in extrapancreatic sites.