Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A PICC line has been removed . An inferior vena cava filter is in place . The heart is at the upper limits of normal size . The mediastinal and hilar contours appear stable . Mild subpleural thickening at each lung apex is also unchanged . There is a patchy density partly effacing each costophrenic angle , suggesting there may be very small pleural effusions with associated atelectasis . Although there is persistent patchy right lower lung opacification , probably for the most part in the right middle lobe , the lungs are much better aerated than on the prior examination .
    OUTPUT:
    
Patchy lower lung opacities , particularly in the posterior left costophrenic angle , possibly pneumonia but more likely persistent or resolving atelectasis associated with decreased pleural effusions .