Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , which leads to bronchovascular crowding . Poorly defined opacities in the left mid and lower lung are new , superimposed on pre-existing linear scarring . Left hemidiaphragm remains mildly elevated compared to the right . There is no pneumothorax , but left apex is obscured by overlying soft tissue structures of the chin and neck , precluding assessment for left apical pneumothorax or parenchymal process in this region .
    OUTPUT:
    
Low lung volumes . Poorly defined left mid and lower lung opacities could reflect atelectasis or developing infectious pneumonia . Standard PA and lateral chest radiographs would be helpful for more complete assessment of these findings when the patient 's condition permits . .