Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly lower resulting in vascular crowding . There is no frank pulmonary edema . Moderate cardiomegaly is stable . Appearance of the mediastinal and hilar contours is unchanged . There may be worsening opacity at the left base likely reflecting atelectasis and possibly small pleural effusion . There is no pneumothorax . There are degenerative changes at the acromioclavicular joints with bony spurring , right greater than left .
    OUTPUT:
    
Possible opacity at the left base likely reflects atelectasis and possibly small pleural effusion . Pneumonia is thought less likely but can not be completely excluded in the right clinical setting . Consider PA and lateral views if patient is amenable .