Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly is unchanged as are the mediastinal and hilar contours . Patchy opacity in the right lung base could reflect resolving infection and / or infarction . A small right pleural effusion appears similar . Linear opacities in the left lung base likely reflect atelectasis . No pulmonary vascular engorgement is seen , and there is no pneumothorax . Degenerative changes of both glenohumeral and acromioclavicular joints are noted .
    OUTPUT:
    
Persistent patchy opacity in the right lower lobe which could reflect residual infection or infarction . Unchanged small right pleural effusion . Subsegmental atelectasis in the left lung base .