Endoscopic diagnosis and management of type I neuroendocrine tumors

Figure 1 Type I gastric neuroendocrine tumor. A: Conventional endoscopic image taken under white light. A hemispherical reddish polyp with a central depression is visible; B: Magnifying endoscopic image taken with a narrow band imaging system. Gastric pit-like structures present on the tumor’s surface, except for the central depression. In the central depression, the pit-like structure was not present, whereas dilated blackish-brown subepithelial vessels with cork-screw capillaries are visible; C: Endoscopic ultrasound showing a hypoechoic intramural structure in the second layer of the tumor; D: Histological appearance. Magnification (40 ×) of a hematoxylin-and-eosin–stained section of the tumor revealing a gastric neuroendocrine tumor limited to the mucosa.