Endoscopic mucosal resection of duodenal bulb adenocarcinoma with neuroendocrine features: An extremely rare case report

Figure 1 Computed tomography, endoscopic image and endoscopic mucosal resection of duodenal tumor with neuroendocrine features. A: Computed tomography (CT) image of a duodenal tumor (arrow); B: Three dimensional CT image reconstruction of the duodenal tumor (arrow); C: Endoscopic image of the duodenal tumor; D: Positive lifting sign after injection of physiological saline with 1:10000 norepinephrine; E: Endoscopic mucosal resection after snare; F: Clean border of the wound after endoscopic mucosal resection (EMR); G: Scar formation on EMR position at gastroscopic review after two months.

Figure 2 Histopathology of duodenal adenocarcinoma with neuroendocrine features. A: Hematoxylin and eosin (HE) staining (original magnification × 40); B: HE staining (original magnification × 100); C: HE staining (original magnification × 200); D: Immunohistochemical staining for synaptophysin (original magnification × 100); E: Immunohistochemical staining for chromogranin (original magnification × 100); F: Immunohistochemical staining for CD56 (original magnification × 100).