Abstract
AbstractWe describe a 61‐year‐old woman with difficulty extending her left ring finger and little finger caused by sarcoid myopathy. As her symptom temporarily improved with carpal flexion or forearm pronation, we once misdiagnosed her as having dystonia of the upper limb. Her symptom gradually worsened, and muscle biopsy specimen revealed sarcoid myopathy. Muscle magnetic resonance imaging of the left forearm showed abnormal signals in the quadriceps femoris and biceps brachii muscles, and the area surrounding the flexor digitorum profundus and supinator muscles. Treatment with prednisolone was effective, and stopped progression of the symptom. Adhesion of the supinator muscle and flexor digitorum profundus as a result of inflammation might have caused limited extension of the flexor digitorum profundus.
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