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Pancreatic divisum is the most common anomaly of the pancreas. Pancreatic divisum associated with malignant tumor is rarely seen. The ampulla of Vater is formed by the union of the common bile duct and the pancreatic duct. The incidence of malignant tumor in the ampulla of Vater is very low. Adenomas and carcinomas are more common. Neuroendocrine tumors originate from enterochromaffin cells of the neuroendocrine system. Ampullary neuroendocrine tumors are very rare and preoperative diagnosis is very difficult. In the literature, the emphasis on imaging characteristics of similar cases is limited. Herein, we present a rare case of pancreatic divisum associated with ampullary neuroendocrine tumor and its characteristics of computed tomography and magnetic resonance imaging.

Aim:To investigate the role of non-contrast magnetic resonance imaging (MRI) and findings of quantitative MRI in the evaluation of pancreatic lipomatosis in patients undergoing bariatric surgery.Methods:Pre-operative and post-operative MRI findings and laboratory test results of 44 obese patients, who underwent sleeve gastrectomy, were reviewed retrospectively. Liver craniocaudal length, hepatic and pancreatic region of interest (ROI) ratios at in-phase and out-of phase sequences (in-phase/out-of phase), pancreas/spleen ROI ratio on T2-weighted sequence (T2 ratio) and thickness of subcutaneous fat were estimated. The relationship between pre-operative and postoperative findings was analyzed.Results:A total of 44 (41 female, three male) patients with a mean age of 42 were included in the study. Liver length, hepatic and pancreatic in-phase/out-of phase ratios, pancreas/spleen T2 ratio and thickness of subcutaneous fat in the post-operative period were found to be lower than those in the pre-operative period (p