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JAMA Dermatology Clinicopathological Challenge |

New Tender Nodules After Arthroscopy QUIZ

Kathleen Ann Long, MS1; Kara Braudis, MD1; Brandon Brown, MD1
[+] Author Affiliations
1Department of Dermatology, University of Missouri–Columbia, Columbia
JAMA Dermatol. 2015;151(4):441-442. doi:10.1001/jamadermatol.2014.4872.
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In this case report, a woman with a history of systemic lupus erythematosus presented with tender erythematous nodules after undergoing right knee arthroscopy. Physical examination revealed poorly demarcated erythematous plaques and nodules, tender to palpation, adjacent to arthroscopy sites. Lesions around the suture sites appeared more violaceous. What is the diagnosis?

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A, Clinical photograph of right knee demonstrating ill-defined erythematous plaques and nodules adjacent to 2 small incisional scars from previous arthroscopy. B and C, Photomicrographs of punch biopsy specimen. B, Hematoxylin-eosin, original magnification ×4. C, Hematoxylin-eosin, original magnification ×10.

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