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Sinus Histiocytosis

The pale, pink patches are sinuses filled with histiocytes in this obturator lymph node draining a cancerous prostate.

The sinus on the right is loosely filled with lymphocytes and histiocytes. The left dumb-bell shaped sinus is packed with histiocytes.

A sinus stuffed with histiocytes with fluffy cytoplasm and poorly-defined cell borders. Note these are not epithelioid histiocytes.

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