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Histologic classification for the chondrocyte proliferation. (Hematoxylin and eosin, ×200, original magnification).
A: Grade 1. Single round chondrocyte (arrow) and two connected chondrocytes (arrowhead). B: Grade 2. Clusterization of four chondrocytes (arrow), surrounded by a pericellular matrix (star). C: Grade 3. Numerous chondrocytes grouped together (arrow).
