Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is a small right - sided effusion , which is minimally increased in size from the prior study . There is a triangular opacity at the lower pole of the right hilus that is less prominent on the current study . Atelectasis at the base of the left lung is unchanged in appearance . The cardiomediastinal silhouette and hila are normal . There is no evidence of pneumothorax .
    OUTPUT:
    
1 . Small right - sided effusion , minimally increased in size from prior study . 2 . Right lower lobe pneumonia , improved in appearance . 3 . Moderate atelectasis at the left base .