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.