Chest radiograph of polymyositis interstitial lung disease

The chest radiograph is from a 62-year-old female patient with polymyositis and interstitial lung disease. The anterior-posterior view (A) shows a reticular pattern dominantly at the bases of the lungs. Image B is a magnified view of the reticular changes in the right lower lung zone. While these findings are non-specific, they are consistent with interstitial lung disease and in a patient with polymyositis, NSIP is most characteristic. The interstitium is best evaluated by high resolution CT scanning of the lungs.