Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . There are several small calcified nodules in the left upper lung suggesting granulomas which are unchanged . Mild subpleural thickening at each lung apex is also unchanged . There is a small - to - moderate new left - sided pleural effusion , patchy associated opacity concerning for pneumonia . Vague right basilar opacity suggesting minor atelectasis is similar to the prior study . Mild degenerative changes are present along the thoracic spine .
    OUTPUT:
    
New pleural effusion on the left and increased left basilar density is concerning for pneumonia .