Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patchy opacities in the right lower lung with corresponding linear opacities projecting over the lower thoracic spine are likely secondary to subsegmental atelectasis , although an infectious process can not be excluded . The lungs are otherwise clear . The heart size is top normal . The mediastinal contours are unchanged . There are no pleural effusions . No pneumothorax is seen .
    OUTPUT:
    
Patchy right lower lung opacities , likely atelectasis , although an infectious process can not be excluded .