Polymyositis is an autoimmune connective tissue disease that can cause interstitial lung disease. The clinical diagnosis is confirmed through muscle biopsy, electromyography findings, and laboratory parameters. Pulmonary involvement due to polymyositis can be radiologically confusing, as many clinical conditions, including other interstitial lung diseases and viral infections, have similar radiological findings. This case, which is clinically and radiologically similar to COVID-19 infection, is presented to highlight the early clinical presentation of polymyositisassociated interstitial lung disease and to emphasize the importance of differential diagnosis in interstitial lung diseases.