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*Sinuses distended with histiocytes - '''key feature'''. | *Sinuses distended with histiocytes - '''key feature'''. | ||
*Plasma cells increased. | *Plasma cells increased. | ||
Notes: | |||
*Sinus histiocytosis should prompt consideration of Rosai-Dorfman disease. | |||
==Kikuchi disease== | ==Kikuchi disease== |
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