Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . Linear opacities in the bilateral mid and lower lungs could represent plate - like atelectasis or scarring . No definite signs of pneumonia , effusion , or pneumothorax . Overall , heart and mediastinal contour appears stable . Bony structures are intact .
    OUTPUT:
    
Linear densities in the bilateral mid and lower lungs , most compatible with atelectasis or scarring .