**3.3. Type 3 GNETs**

Type 3 NETs (10–15%) are sporadic, usually poorly differentiated, single tumours >10 mm in size not associated with gastrin hypersecretion. These tumours have the tendency to invade proper muscular layer and are frequently metastatic (in regional lymph nodes, liver) at the time of diagnosis [18–20].

There are reports that suggest that in selected cases (<2 cm, well differentiated, submucosal, without lymphovascular invasion) type 3 GNETs should be treated with endoscopic or wedge resection. Despite that, ENETS guidelines strictly recommend type 3 GNETs to be treated like gastric carcinomas with distal or total gastrectomy and lymphadenectomy [18, 20].
