case_images: PMC3806691_01
case_images: Axial CT with intravenous and gastrointestinal contrast. A large homogeneous retroperitoneal mass encases the superior mesenteric artery (arrow), displaces the stomach (St) and insinuates into the hepatic hilum. L = Liver; K = kidney; C = colon.
case_images: cro-0006-0493-g01.jpg
case_images: PMC3806691_01_cro-0006-0493-g01.jpg
case_images: F1
case_images: Abdominal axial computed tomography (CT) with intravenous and gastrointestinal contrast revealed a large retroperitoneal mass encasing the superior mesenteric artery, displacing the stomach and infiltrating into the liver (fig. 1).
case_images: Representative HE and IHC results for the retroperitoneal mass. a High-power of the retroperitoneal HCL showing characteristic cell morphology. b IHC showing TRAP staining positivity, typical of HCL.
case_images: cro-0006-0493-g02.jpg
case_images: PMC3806691_01_cro-0006-0493-g02.jpg
case_images: F2
case_images: Histologic examination of the mass by standard hematoxylin and eosin (HE) staining revealed extensive HCL cells (fig. 2a). Additionally, IHC analysis revealed that the tumor cells were CD20 and tartrate-resistant acid phosphatase (TRAP) positive (fig. 2b).