Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest . There is persistent indistinctness of the pulmonary vasculature which could be due to mild congestion or chronic underlying parenchymal changes without superimposed confluent consolidation . Blunting of the left costophrenic angle could be due to an effusion . Cardiomediastinal silhouette is within normal limits . No acute osseous abnormality identified .
    OUTPUT:
    
Possible small left pleural effusion , otherwise no change .