VIPoma Presenting With Obstructive Jaundice: A Case Report.

VIPoma is a rare pancreatic neuroendocrine tumor characterized by the overproduction of vasoactive intestinal peptide (VIP), typically manifesting as watery diarrhea, hypokalaemia and metabolic acidosis. Its presentation can be atypical, complicating diagnosis. We report the case of a 30-year-old male who initially presented with obstructive jaundice and fatigue, with imaging revealing a pancreatic head mass and liver metastases. Histopathological analysis confirmed a lowgrade pancreatic neuroendocrine tumor. The clinical course was complicated by portal vein thrombosis and metastatic spread. Six months later, the patient developed persistent, refractory watery diarrhea with associated hypokalaemia. Elevated serum VIP levels and Gallium-68 DOTATATE positron-emission tomography and computed tomography (PET-CT) supported the diagnosis of VIPoma. Symptom resolution was achieved with subcutaneous octreotide, followed by transition to monthly long-acting release (LAR) octreotide. Approximately 60% of VIPoma cases are metastatic at the time of diagnosis, as demonstrated in this patient. The case highlighted the diagnostic challenges of VIPoma in the presence of atypical symptoms such as jaundice and absence of initial diarrhea. It also underscores the need for close multidisciplinary collaboration to determine the best course of action and to optimize patient outcomes.