Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 17 : 17 is submitted .
    OUTPUT:
    
Lungs remain hyperinflated suggesting underlying emphysema . Streaky opacities at the bases more likely reflect scarring or subsegmental atelectasis rather than an acute infectious process . However , clinical correlation is advised . No evidence of pulmonary edema . Small left effusion , less apparent on the current study than on the prior . Overall cardiac and mediastinal contours are unchanged with the heart being mildly enlarged . Degenerative changes of both glenohumeral joints with no acute bony abnormality appreciated .