Clinicopathological evaluation of duodenal well-differentiated endocrine tumors

Figure 1 Upper gastrointestinal endoscopy showed a submucosal-tumor-like, protruding lesion 0. 7 cm in diameter, arising in the anterior wall of the duodenal bulb. The top of the tumor was yellowish white, with dilated blood vessels.

Figure 2 Upper gastrointestinal endoscopy showed a homogenous, oval hypoechoic mass, mainly located in the third layer.

Figure 3 Histopathological examination. A: Macroscopic view of resected specimens obtained by endoscopic mucosal resection (hematoxylin and eosin staining). The longest diameter was 0.7 cm; B: Histopathological examination of specimens (hematoxylin and eosin staining, × 10) showed that cubic, atypical cells forming follicular or glandular patterns, with rounded nuclei and eosinophilic syncytia; C: Histopathological examination of specimens (chromogranin A staining, × 10) showed that tumors stained positively for chromogranin A.