Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The heart is of top normal size with stable cardiomediastinal contours . The right lung base linear opacity is similar to multiple prior examinations , compatible with chronic mucoid impaction . Known right lower lobe nodule is not clearly visualized on this exam . Small right pleural effusion is present , similar to prior . No radiopaque foreign body . Multilevel thoracic spine degenerative changes .
    OUTPUT:
    
Right lower lung linear opacity , similar to prior and likely reflects chronic mucoid impaction . Small right pleural effusion is also similar to prior .