Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . There is no pleural effusion or pneumothorax . The lungs appear clear aside from a patchy lingular opacity , which can probably be attributed to minor atelectasis , noting clinical context and mild relative elevation of the left hemidiaphragm . Bony structures are unremarkable .
    OUTPUT:
    
Patchy left basilar opacity , probably due to minor atelectasis , with no definite acute disease . Stable mediastinal and hilar contours .