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Unusual organ involvement in sarcoidosis: sarcoid myopathy and peritoneal sarcoidosis
  1. Masaki Itagane and
  2. Mitsuyo Kinjo
  1. Rheumatology, Okinawa Chubu Hospital, Uruma, Okinawa, Japan
  1. Correspondence to Dr Mitsuyo Kinjo; kinjomitsuyo{at}


Myopathy and peritoneal involvement are rare complications of sarcoidosis, and the latter can mimic malignancy with peritoneal dissemination. In this case, a patient with a history of polyarthritis and positive rheumatoid factor presented with proximal muscle weakness and abdominal pain. Biopsies of muscle and peritoneum revealed non-caseating granuloma suggesting sarcoidosis. Ocular and pulmonary involvement later developed and confirmed the diagnosis of sarcoidosis.

  • musculoskeletal syndromes
  • connective tissue disease

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  • Contributors MI wrote the manuscript and collected data. MK contributed to overall writing.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.