Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal , and hilar contours appear unchanged . Density of the left hemithorax appears diffusely increased compared to the right , but this appearance is suspected to represent an artifact associated with soft tissue attenuation . There is no pleural effusion or pneumothorax . The lung volumes are low .
    OUTPUT:
    
No definite evidence of acute disease . Veil - like increased opacity over the left hemithorax , probably an artifact . However , short - term radiographs could be considered to follow up , particularly if pulmonary symptoms are present or for other concern .