Osteoclast in joint fluid

 
Osteoclast
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In this smear from a dog with degenerative joint disease, ther is a multinucleated cell with pink granulation compatible with an osteoclast (arrow). This suggests erosion of or damage to cartilage, exposing subchondral bone. The remaining cells are mononuclear, being a mixture of macrophages (not activated) and lymphocytes (arrowhead), with the former dominating.

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