Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . Right chest wall port is again seen in unchanged position . There is persistent left - sided pleural effusion . There is also opacity at the left lung base medially , silhouetting the descending thoracic aorta which could be due to atelectasis and is similar compared to PET - CT from ___ . Elsewhere , lungs are clear of new consolidation . There may be trace right effusion as well . The cardiomediastinal silhouette is unchanged . No acute osseous abnormality identified . Thoracolumbar S - shaped scoliosis is again noted .
    OUTPUT:
    
Persistent small left and possible trace right effusion is unchanged . No definite acute cardiopulmonary process .