Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . There is a small residual right - sided loculated pleural effusion but decreased with associated streaky opacities suggesting minor associated atelectasis . Overall , however , aeration is much better than the more recent of the prior radiographs . Mild degenerative changes affect the lower thoracic spine .
    OUTPUT:
    
Atelectasis at the right lung base with small but decreased pleural effusion .