Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Since the prior exam , there has been development of consolidation in the left lower lobe , which could represent pneumonia or atelectasis and probable adjacent effusion . The patient is known to have adjacent rib fractures and the possibility of a hemothorax is not excluded . The right lung remains clear . Heart size is difficult to assess . Mediastinal contour appears grossly stable . The known rib fractures are better seen on the prior CT scan . Vein in the left upper abdomen is partially imaged .
    OUTPUT:
    
Left lower lobe consolidation concerning for atelectasis and / or pneumonia . Left effusion , can not exclude hemothorax given patient 's known adjacent rib fractures as seen on the prior CT torso .