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<b><i>Introduction:</i></b> The characteristics, prognostic factors, and management of duodenal neuroendocrine neoplasms (dNEN) are ill-defined, given their rarity. Whether nonsurgical management might be appropriate for patients with nonmetastatic dNEN and a good prognosis, as is the case for pancreatic NEN (pNEN), is unknown. We aimed to describe the management and prognosis of nonmetastatic dNEN patients. <b><i>Methods:</i></b> All consecutive patients with nonmetastatic dNEN managed between 1981 and 2018 in 2 expert centers were included. Recurrence-free survival (RFS) and factors associated with recurrence were estimated. <b><i>Results:</i></b> A total of 145 patients with dNEN were included. Twenty-eight patients with sporadic, nonfunctioning, small (median 7 mm) dNEN underwent endoscopic resection, with a 5-year RFS rate of 89.4%. Local recurrence occurred in 2 patients, who underwent surgery with no new events. The 5-year RFS rate was 87.9% in patients who underwent surgery. Upon univariate analysis, age, size, Ki67 index, and lymph node involvement (LN+) were significantly associated with worse RFS for all dNEN treated (endoscopy/surgery); multivariate analysis found that age, size, and LN+ were associated with worse RFS. <b><i>Conclusion:</i></b> Selected nonmetastatic dNEN had a favorable outcome, and a less invasive therapeutic strategy appeared more suitable than oncological surgery.

<b><i>Introduction:</i></b> Small-intestinal neuroendocrine tumors (SI-NET) are situated preferentially within the ileum. The aim was to describe a potential difference in location between unifocal and multiple ileal-NET. <b><i>Patients and Methods:</i></b> Between December 2010 and December 2019, all consecutive patients who underwent resection in our European Neuroendocrine Tumor Society Center of Excellence, of at least 1 non-duodenal SI-NET, were retrospectively included. The main objective was to prove that multiple ileal-NET were mostly located on the left side of the superior mesenteric artery (SMA) axis (defined as 40 cm from the ileocecal valve), and unifocal ones on the right side. <b><i>Results:</i></b> Ninety-four patients were included, 6 with unifocal jejunal-NET located 35 cm (range, 10–60) from the duodenojejunal angle (DJA), 44 (47%) with unifocal ileal-NET and 44 (47%) with multiple ileal-NET. The median number of tumors in multiple ileal-NET was 7 (range, 2–95), within a median small bowel segment of 105 cm (10–240). The median length between the proximal tumor and the DJA was 428 cm (300–635) and 540 cm (350–725) for the distal one; 40 (91%) of them were located on the left side of the SMA axis. In contrast, unifocal ileal-NET were located at a median distance of 577 cm (305–820) from the DJA (<i>p</i> &#x3c; 0.001, compared to multiple ileal-NET); 30 (68%) of them were on the right side of the SMA axis (<i>p</i> &#x3c; 0.001). <b><i>Conclusion:</i></b> Multiple ileal-NET are mostly located on the left side of the SMA axis. Further studies are warranted to explore the embryological origin of unifocal versus multiple ileal-NET.