Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are subtle linear and nodular opacities in the right upper lobe and a single 5 mm nodule left upper lobe . The pleural surfaces and the cardiomediastinal are otherwise unremarkable .
    OUTPUT:
    
There are subtle linear and nodular opacities in the right upper lobe and a single 5 mm nodule left upper lobe . Both changes could reflect pulmonary pathology , a CT is recommended for characterization .