Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal portable view of the chest was obtained . Allowing for patient rotation with respect to the film , the heart size and cardiomediastinal contours are normal . Linear opacity in the left lower lobe is compatible with atelectasis . The lungs are otherwise clear . No pleural effusion or pneumothorax . Metallic clips are present in the left upper quadrant . Left nephrostomy catheter is incompletely imaged . Osseous structures are unremarkable .
    OUTPUT:
    
Left lower lung linear opacity , compatible with atelectasis .