Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . Somewhat linear left basilar opacities seen , most suggestive of atelectasis . Lungs are otherwise clear without focal consolidation . There is trace blunting of the posterior right costophrenic angle as on prior which could be due to trace effusion . Cardiomediastinal silhouette is within normal limits . No acute osseous abnormality is identified .
    OUTPUT:
    
Possible trace pleural effusion and left basilar atelectasis . Otherwise , no acute cardiopulmonary process .