They usually look like small Polyps <2 cm although up to 25% of Type I G-NETs are not macroscopically visible during endoscopy. They become only apparent in histological study. In such cases they are called intramucosal carcinoid tumors 10.
Se observan como pólipos de pequeño tamaño <2 cm, pero hasta el 25% los TNE-G tipo I no son visibles macroscópicamente durante la endoscopia y solo son aparentes al estudio histológico, en estos casos se denominan "carcinoides intramucosos" 10.