Case Report
Copyright ©The Author(s) 2022.
World J Gastroenterol. Sep 14, 2022; 28(34): 5086-5092
Published online Sep 14, 2022. doi: 10.3748/wjg.v28.i34.5086
Figure 1
Figure 1 Imaging findings at the time of diagnosis. A and B: Esophagogastroduodenoscopy revealed a 10-mm soft yellowish submucosal lesion with the “pillow sign,” located in the second portion of duodenum, immediately upon the duodenal papillary; C: Abdominal contrast-enhanced computed tomography shows a suspicious low-density lesion in the periampullary region without enhancement (white arrow); D: Endoscopic ultrasonography with a 12-MHz catheter probe showed a hyperechoic, homogenous, and round solid lesion with echo attenuation, arising from the submucosal layer; E: Deep biopsy via bite-on-bite technique with forceps was performed; F-H: Microscopic examination showed a small amount of roundish adipocyte in the submucosa layer, expressing S-100. Tiny lipid droplets were observed in cell cytoplasm. The glands of epithelium were neatly arranged on top (F: Hematoxylin and eosin staining, × 200; G: Immunohistochemical S-100 stain, × 100; H: IHC S-100 stain, × 200).