Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest . Prior right PICC is no longer visualized . Lower lung volumes are seen on the current exam . The lungs remain clear of besides mild retrocardiac opacity . The cardiomediastinal silhouette is stable . Degenerative changes are seen at the shoulders .
    OUTPUT:
    
Retrocardiac opacity , potentially atelectasis , infection is not excluded . Consider repeat with PA and lateral .