Extranodal Rosai–Dorfman Disease Presenting as a Mediastinal Mass with Pulmonary Artery Invasion

Figure 4

Biopsy results. (a) Hematoxylin and eosin stain (H&E) at 2x magnification–fibrosis with chronic inflammatory cell response. (b) H&E at 20x magnification–macrophages with lymphocytes and plasma cells. (c) H&E at 40x magnification–emperipolesis. (d) CD163 immunostain at 20x magnification highlighting macrophages. (e) CD45 immunostain at 40x magnification highlighting lymphocytes and emperipolesis.

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