File:PMC2827789 kjr-11-239-g001.png

English: F1: Follicular dendritic cell sarcoma in 69-year-old man.A. Abdominal ultrasonography shows 5 cm sized, well-defined anechoic mass (white arrows) that was located in posterior aspect of pancreas (P) with mild mass effect. Mass shows posterior acoustic enhancement that represents necrotic lesion.B. Axial CT scan shows well-defined necrotic mass with thin peripheral wall in retroperitoneal area (white arrows). Lesion shows mass effect on adjacent pancreas and splenic vein, but there was no evidence of direct invasion.C. Coronal reconstruction CT image shows several enlarged lymph nodes (black arrows) around cystic mass (white arrows).D. Gross specimen shows central whitish-yellow color that microscopically demonstrates extensive internal necrosis.E. Microscopic examination of solid component of mass reveals bundles of ovoid to spindle cells with pinkish cytoplasm (Hematoxylin & Eosin staining, ×100).