Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Low lung volumes . Overlying EKG leads are present . Streaky lower lung and perihilar opacities may represent atelectasis . Mild elevation of the right hemidiaphragm is unchanged . Difficult to exclude a pneumonia in the lower lungs . The upper lungs are well aerated . No pneumothorax or large effusion . Cardiomediastinal silhouette is unchanged . Bony structures appear intact . There is an old right clavicular deformity .
    OUTPUT:
    
Perihilar and lower lung lobe linear / streaky opacity likely atelectasis , difficult to exclude pneumonia .