Clinical impact of atypical endoscopic features in rectal neuroendocrine tumors.

Aim: To validate the association between atypical endoscopic features and lymph node metastasis (LNM).

Methods: A total of 247 patients with rectal neuroendocrine tumors (NETs) were analyzed. Endoscopic images were reviewed independently by two endoscopists, each of whom classified tumors by sized and endoscopic features, such as shape, color, and surface change (kappa coefficient 0.