Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: One AP view of the chest . The left costophrenic angle is not completely imaged . The previously seen small left pleural effusion is difficult to evaluate . No right pleural effusion . No consolidation or pneumothorax . The cardiomediastinal and hilar contours are normal .
    OUTPUT:
    
Previously seen small left pleural effusion is difficult to evaluate due to incomplete imaging of the left costophrenic angle , however , does not appear significantly larger . No evidence of pneumonia .