General
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• 10% of patients have joint involvement, usually polyarticular
• Most common involvement is acute polyarthritis / periarthritis (Jansen and Geusens: Sarcoidosis: Joint, Muscle and Bone Involvement)
• Usually resolves quickly, but occasionally progresses to chronic granulomatous arthritis resembling tuberculosis but without caseation or lymphocytes

Micro images
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C: sarcoidosis

Virtual slides
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Bone, joint sarcoidosis

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