Fig. 4
From: ROSE in Rosai–Dorfman–Destombes (RDD) disease: a cytological diagnosis
a–e Cell block preparation from the lymph node aspirate showing lymphoid follicles with germinal centers along with numerous foamy histiocytes having engulfed plasma cells, lymphocytes and neutrophils. Few scattered plasma cells were also seen in the stroma (H&E, × 10, × 40 and × 100). e Immunohistochemistry from the cell block preparation is showing positive for S100 and negative for CD1a (inset) (IHC, × 100)