Fig. 2
From: Isolated intradural Rosai-Dorfman disease of the spine: report of two cases
Histopathology shows a lesion composed of dilated spaces filled with histiocytes admixed with lymphocytes and plasma cells (a: hematoxy-eosin stain, Original magnification × 200). The histiocytic cells show strong immunoreactivity for S100 and CD68 (b, c: Original magnification × 200)