Role of endoscopic ultrasound in pediatric patients: A single tertiary center experience and review of the literature

Figure 1 Endoscopic ultrasound and hematoxylin/eosin staining. A: Pancreatic head mass with fine needle aspiration; B: Hematoxylin/eosin staining: Shows cellular tumor tissue formed by small cells with focal resetting and tumor cell nuclei show fine chromatin with a little cytoplasm (Hematoxylin/eosin, 400 ×); C: Shows moderate membranous reaction of the tumor cells (CD56, 400 ×); and D: Show positive nuclear staining in a few tumor cells (< 2%) (Ki-67, 400 ×); consistent with a well-differentiated neuroendocrine tumor.