An unusual case of idiopathic inflammatory myopathy presenting with organizing pneumonia as cavitary lesions.

A young woman presented with gradually progressive breathlessness, cough and muscle weakness for one and a half year. Her chest radiograph showed multiple, bilateral thin-walled cavitary lesions. Her serum was found to be positive for anti-Jo1 antibodies on serology. Histopathology of lung lesions was suggestive of organizing pneumonia. The muscle biopsy demonstrated a myopathic pattern. On the basis of these findings she was diagnosed to be the case of idiopathic inflammatory myopathy. Her condition improved significantly after treatment with steroids.