Extensive intramuscular manifestation of sarcoidosis with initially missed diagnosis and delayed therapy: a case report.

Background: Sarcoidosis is a multisystemic granulomatous disorder, which in nearly all cases involves the lungs and other organs. Isolated forms of sarcoidosis within the muscles, but without lung involvement, are extremely rare and can lead to delayed or even false diagnosis.

Case Presentation: A 52-year-old white, Swiss man presented with painful arm cramps and a history of symptoms over the previous 3 years.