Vipoma (Werner-Morrison Syndrome) By Minhhuyen Nguyen, MD, Fox Chase Cancer Center, Temple University Reviewed / Revised Mar 2021 | Modified Sep 2022 View Patient Education Symptoms and Signs Diagnosis Treatment Key Points A vipoma is a non-beta pancreatic islet cell tumor secreting vasoactive intestinal peptide (VIP), resulting in a syndrome of watery diarrhea, hypokalemia, and achlorhydria (WDHA syndrome).