Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP upright portable view of the chest was obtained . There are relatively low lung volumes . Increased interstitial markings bilaterally are likely due to patient 's known chronic lung disease . No large pleural effusion or pneumothorax is seen . No definite focal consolidation . The cardiac and mediastinal silhouettes are grossly stable . Degenerative changes are seen at the shoulder joints .
    OUTPUT:
    
Chronic changes without definite acute process seen .