“…Because duodenal NETs are generally small in size (mean 1.2–1.5 cm) (>75% <2 cm) [4, 5, 10, 11, 21, 22, 24, 25, 27, 28], they are frequently missed (>80%) with conventional imaging studies (CT, MRI, ultrasound, angiography) [15, 29, 30, 33,48,49,50,51,52]. Studies in duodenal gastrinomas demonstrate that conventional imaging studies detect ≤15% of gastrinomas <1 cm in diameter, 20–50% 1–3 cm in diameter and 95% >3 cm in diameter [48, 50, 53].…”