case_images: PMC10861742_01
case_images: CT shows upper pancreatic occupancy and three hypodense foci in the right lobe of the liver. A round cystic-solid mass is observed at the superior border of the pancreas with heterogeneous internal density. Arcuate calcifications and tortuous vascular are seen at mass margins. It has a relatively well-defined border. The enhancement scan shows progressive enhancement, with solid and envelope enhancing and cystic areas not enhancing. The mass is well demarcated from the spleen, and the splenic artery is displaced by compression.
case_images: fonc-14-1335930-g001.jpg
case_images: PMC10861742_01_fonc-14-1335930-g001.jpg
case_images: f1
case_images: The mass is well demarcated from the spleen, and the splenic artery is displaced by compression ( Figure 1 ).
case_images: (A) Postoperative pathological result of the retroperitoneal occupancy: retroperitoneal solid pseudopapillary neoplasm (H&E staining, x200). (B) The tumor cells have a mild morphology. They are oval, with medium cytoplasm and common nuclear grooves (H&E staining, x400). (C) Immunostaining for beta-catenin showing a positive reaction (x200). (D) Immunostaining for CD99 displaying a positive reaction (x200).
case_images: fonc-14-1335930-g002.jpg
case_images: PMC10861742_01_fonc-14-1335930-g002.jpg
case_images: f2
case_images: The immunohistochemical analysis revealed that the tissue was positive for AE1/AE3 (CK), CK8/18, Syn, CgA, beta-catenin, CD56, CD99, and Ki-67 (approximately 2%+) ( Figure 2 ).