Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were reviewed . Compared to the prior study , the left PICC line has been removed . A high right hemidiaphragm contour is unchanged . There are linear opacifications in the left lower lung . The heart and mediastinal contours are normal . There is no vascular congestion , pleural effusion or pneumothorax . The bones and soft tissues are unchanged .
    OUTPUT:
    
Linear opacity in the left lower lung is most likely due to atelectasis but in view of the clinical history pneumonia should be considered .