Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . The heart size is within normal limits . No configurational abnormality is identified . Normal appearance of thoracic aorta . No mediastinal abnormalities are present . The pulmonary vasculature is not congested . No evidence of acute discrete local parenchymal infiltrates are present . Similar as seen on several previous examinations , the patient now has increased interstitial markings on the bases and the diaphragms are relatively low positioned and somewhat flattened , all findings suggestive of COPD . Acute infiltrates however can not be identified and there is no evidence of pulmonary vascular congestion as the heart size is completely within normal limits . On several previous portable single view chest examinations of ___ and ___ , the patient had some episodes of scattered small parenchymal infiltrates on the lung bases , but this is not the case presently .
    OUTPUT:
    
Findings compatible with COPD , but no signs of exacerbating infiltrates .