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Mesenchymal chondrosarcoma ((A), HE, 200×). A mixture of round cells ((A2), white asterisk,; HE, 200×) with islands of well-differentiated hyaline cartilage ((A1), black asterisk; HE, 200×); the proportions of these two components may vary ((B1), HE, 100×; (B2)), HE, 200×); (SOX9) (SRY-Box Transcription Factor 9, 200×) is highly expressed supporting the differential diagnosis of mesenchymal chondrosarcoma. Photos by Anna Szumera-Ciećkiewicz.
