Sir, Sarcoidosis is an immune-mediated condition affecting numerous organs, especially the lungs, lymph nodes, skin and eyes.1 Although asymptomatic muscle involvement is common in sarcoidosis (50–80% of histological cases), symptomatic myopathy is rare, being encountered in 0.5–2.3% of the patients.1 We recently observed a case of symptomatic myositis revealing a recurrence of sarcoidosis with favorable outcome after initiation of infliximab; our case is of particular interest, as it indicates that whole body fluorodeoxyglucose positron emission tomography (FDG-PET) is a useful test for both diagnosis and follow-up of myopathy in sarcoidosis. A 43-year-old man was diagnosed as having both biopsy-proven pulmonary and muscle sarcoidosis in October 2005. In October 2008, the patient was asymptomatic; he still received combined therapy of prednisone (15 mg daily) and methotrexate (30 mg weekly), and steroid therapy regimen was reduced (12.5 mg per day). In January 2009, the patient was admitted for a 2-month history of myalgia and muscle weakness involving his lower limbs; …