Fig. 1.
Morphological, immunohistochemical, and genetic features of LBCL-IRF4 (case no. 35). a Large B-cell lymphoma with blastoid morphology with medium-sized cells, inconspicuous nucleoli, and scant cytoplasm (original magnification × 200; hematoxylin and eosin stain); b with original magnification × 400: hematoxylin and eosin stain; c original magnification × 400: Giemsa stain. d MUM1. e CD10. f Fluorescence in situ hybridization (FISH) analysis using a break apart probe (BAP) demonstrates an IRF4 break with 1 colocalized signal (yellow arrow) and 1 split signal (green and red arrows) consistent with gene rearrangement. g FISH analysis with a BAP demonstrates an IGH break with 1 colocalized signal (yellow arrow) and 1 split signal (green and red arrows) consistent with gene rearrangement (Fig. 1 was created using Adobe Photoshop Version CS6)