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. 2009 Oct;467(10):2755-9.
doi: 10.1007/s11999-009-0716-y. Epub 2009 Jan 29.

A 38-year-old man with left knee pain

Benjamin K Potter  1 , Sheila C Adams, Mark J Kransdorf, H Thomas Temple
Affiliations

A 38-year-old man with left knee pain

Benjamin K Potter et al. Clin Orthop Relat Res. 2009 Oct.
No abstract available

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Figures

Fig. 1A–B
Fig. 1A–B
Preoperative (A) anteroposterior and (B) lateral radiographs of the left knee show a lytic, geographic 1C lesion of the proximal medial tibia. Cortical thinning and extension to subchondral bone are evident, but there is no overt matrix production, periosteal reaction, or cortical breakthrough.
Fig. 2A–B
Fig. 2A–B
Preoperative coronal (A) T1-weighted and (B) T2-weighted STIR MR images show the lesion is mildly heterogeneous with hypointense to isointense signal versus muscle on the T1 images and increased signal versus fat on STIR imaging. There is extensive abnormal signal extending medially into the adjacent soft tissues, and mildly increased signal in the marrow adjacent to the lesion.
Fig. 3A–B
Fig. 3A–B
Postoperative (A) anteroposterior and (B) lateral radiographs show the patient’s knee after open biopsy, intraoperative frozen section analysis, extended curetting and phenolization, and polymethylmethacrylate packing of the lesion.
Fig. 4A–C
Fig. 4A–C
(A) Low-power (original magnification, ×200) and (B) high-power (original magnification, ×600) photomicrographs of the curetted specimen show atypical lymphocytes and histiocytic cells with grooved or vesicular nuclei and prominent nucleoli (Stain, hematoxylin and eosin). (C) The tissue stained diffusely positive for CD20 (original magnification, ×200).
See this image and copyright information in PMC

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