increased opacities in the right upper, left lower, and right lower lobes could represent progression of known interstitial lung disease or superimposed infectious process. correlation with clinical symptoms is recommended. if clinical symptoms of an infection are present, repeat chest radiograph after four weeks of antibiotic treatment is recommended to document resolution of the opacities; however, if the patient has no symptoms, ct is recommended for further characterization of a possible neoplastic process in the right lower lobe.