Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest . Again seen is a left basilar opacity in part due to small to moderate pleural effusion . There may also be trace residual right pleural effusion . Superiorly , the lungs are clear . The cardiomediastinal silhouette is unchanged . No acute osseous abnormalities detected .
    OUTPUT:
    
No significant interval change noting left basilar opacity compatible pleural effusion with underlying atelectasis , noting that underlying infection can not be excluded .