Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size remains mildly enlarged . The aorta is tortuous and demonstrates atherosclerotic calcifications . Hilar contours are unremarkable . Left PICC has been removed . Scarring is seen within the lung apices . Increased peripheral interstitial markings are noted bilaterally , more pronounced within the upper lung zones , and reflective of a chronic interstitial abnormality , better assessed on the prior CT . Atelectatic changes are noted in the lung bases , but no focal consolidation , pleural effusion or definite pneumothorax is identified . Skin ___ are seen projecting over the midline abdomen . No free subdiaphragmatic air is seen though the patient is not an optimal upright position .
    OUTPUT:
    
1 . No subdiaphragmatic free air demonstrated on this semi-upright exam . 2 . Chronic interstitial abnormality most pronounced in the upper lobes , as demonstrated on the prior CT which was characterized as subpleural interstitial fibrosis . 3 . Patchy opacities in the lung bases , likely atelectasis .