Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views have been obtained with patient in upright position . The heart size is normal . No configurational abnormality is seen . Thoracic aorta mildly widened and elongated , but no local contour abnormalities are present . The pulmonary vasculature is not congested . There are multiple linear peripheral densities in both lungs . They are located in the right upper lobe area lateral segment on the right side . Also some linear atelectasis resembling densities are present on the right lung base partially overlying the diaphragmatic contours . Most marked linear densities are present on the left lung base where a crowded retrocardiac pulmonary vasculature is observed . Remarkable is that the lateral and posterior pleural sinuses are free from any fluid accumulation or significant pleural thickening . Apical area does not reveal any pneumothorax . Skeletal structures are grossly unremarkable . Our records do not include a previous chest examination available for comparison .
    OUTPUT:
    
Multiple linear densities in peripheral location in both lungs . These changes are most marked on the left base in retrocardiac location . In the latter area , parenchymal densities of peribronchial infiltrate nature are suspected . Absence of any pleural abnormalities . The described changes give the impression of chronic abnormalities such as multiple peripheral atelectases and scar formations in a patient with perhaps COPD . Our records have no previous chest examinations available for comparison . Followup examination is recommended . One could also consider recommendation for CT to evaluate the rather advanced and unusual chest findings in this patient without apparent pulmonary history .