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This tumor was excised recently. During the procedure, the surgeon noted prominent hemosiderin pigmentation running along the tumor resection bed and wanted to know intraoperatively of he could assume that this meant that tumor was also present in these areas. Indeed, examining the excision specimen revealed aggregates of mononuclear cells with abundant hemosiderin deposition. These areas were admixed haphazardly with tumor foci. Surgical margins were extensively positive. Hemosiderin deposition is characteristic of this tumor, so much so that it is likened by the WHO to pigmented villonodular synovitis in this reguard.

----Comment by: Iago on 6/25/2008 7:11:39 PM

     

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