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Malignant Gastric Outlet Obstruction from Pancreatic Cancer. Patients with advanced-stage pancreatic cancer are typically burdened by many symptoms that impair functioning and worsen quality of life. We report an exceptional case of a 73-year-old woman with T4N1M0 adenocarcinoma of the uncinate process of the pancreas who developed significant gastric outlet obstruction - an uncommon yet potentially life-threatening complication of disease progression. She developed progressive abdominal pain and emesis, and profound dilatation of her stomach was detected on a radiation therapy simulation CT scan that required urgent decompression. Malignant gastric outlet obstruction must be included in the differential diagnosis when patients with known advanced disease of the pancreas present with obstructive upper gastrointestinal symptoms.