Introduction: Gastrinomas are neoplasms that occur in 0.1% of patients with peptic ulcer disease (PUD). We present the case of a neuroendocrine tumor with liver metastasis in a woman with acid peptic disease. Clinical case: 46 yo F with 2 year diagnosis of gastroesophageal reflux disease (GERD) presents with epigastric pain and pyrosis, in addition to colicky right upper quadrant (RUQ) abdominal pain. Upper gastrointestinal endoscopy showed gastritis, multiple antral ulcers and erosive duodenitis. Positive rapid urease test prompted the start of a Helicobacter pylori eradication regimen. Due to continuing RUQ pain, an abdominal ultrasound (US) was ordered. It showed a lesion in the right lobe of the liver measuring 6.4 x 8.3 cm. The patient was referred for admission for further studies. At admission, the patient continued with symptoms of GERD. Laboratory testing showed: glucose: 87 mg/dl (n <100 mg/mL), creatinine: 0.5 mg/dl (n 0.4 - 1.1 mg/mL), total leucocytes: 7.3 x 109/L (n 4.0 -11.0 x 109/L), hemoglobin: 13.2 g/dL (n 12.3-15.3 g/dL), and no alterations on coagulation tests. Gastroscopy showed erythematous mucosa and three duodenal ulcers in scarring stage. A hormone evaluation showed: gastrin: 19,500 pg/ml (n 0-100 pg/mL), ACTH: 17pg/mL (n 5-27 pg/mL), cortisol: 21 µg/dL (n 7-28 µ/dL), GH: 0.3 ng/mL (n <10 ng/mL) , prolactin: 23 ng/mL (n 2-29 ng/mL), PTH: 64 pg/ml (n 10-65 pg/mL), calcium: 8.8 mg/dl (8.9-10.2 mg/dL), and phosphorus: 3.6 mg/dl (n 2.5-4.5 mg/dL). Liver biopsy revealed a neuroendocrine tumor (NET). Octreoscan corroborated the liver lesion, in addition to a lesion in the tail of the pancreas. The patient underwent extended right hepatectomy, distal pancreatectomy and splenectomy. Two lesions were identified in the pancreas, one of 2.4 x 1.6 cm and another one of 1.1 x 0.5 cm. A lesion measuring 13.2 x 8.7 cm and another one of 2.4 x 2 cm was found on the liver surgical sample. Immunohistochemical staining for gastrin and glucagon for the neuroendocrine metastatic tumor was positive. Conclusion: Approximately 25% of gastrinomas are associated with multiple endocrine neoplasia type 1; in this case, the gastrinoma appears to be sporadic. Gastrinomas occur more frequently in men (3:1), and it is diagnosed most frequently between the ages of 20 and 50. Zollinger-Ellison syndrome presents with recurrent PUD in over 90% of cases. The diagnosis is suspected because of clinical presentation, and gastrin levels, which are generally above 1000 pg/ml. Octreoscan is preferred due to its superior sensibility in comparison to other tests for tumor detection. Alternatively, MRI, spiral CT scan, and endoscopic US can be used. Metastases resection, when anatomically possible, is recommended for the treatment of liver metastasis, in addition to somatostatin analogs for symptoms management. Other treatment modalities are chemoembolization and systemic chemotherapy.