Fig. 1
From: Primary pancreatic Ewing sarcoma with metastases on FDG PET/CT
Hematoxylin and eosin stain: showing monotonous population of small round cells and tumor cells arranged in sheets and rosettes (200X) (A), Homer Wright rosettes (arrow) consist of a central neutrophil surrounded by concentrically arranged tumor cells (400X) (B), Vimentin: strong diffuse staining in tumor cells (400X) (C) and CD99: strong and diffuse membranous staining in tumor cells (400X) (D)