Figure 2
From: Extranodal Rosai–Dorfman disease: a rare soft tissue neoplasm masquerading as a sarcoma
Microscopic examination of right medial thigh mass demonstrating characteristic emperipolesis. (a) Groups of lymphoid aggregates (black arrow) and scattered pale areas of fibroadipose tissue (H & E stain, original magnification ×10). (b) Histiocytes and multinucleated cells among mixed inflammatory cells that include plasma cells and lymphocytes (H & E stain, original magnification ×20). (c) Histiocytes engulfing lymphocytes and plasma cells (emperipolesis) (H & E stain, original magnification ×40).