Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are normal . Right basilar opacification has progressed compared to the previous exam . Patchy left basilar opacity persists , similar to the prior study There is a small right pleural effusion which is new . No overt pulmonary edema is noted . There is no pneumothorax . No acute osseous abnormalities are present .
    OUTPUT:
    
Worsening right basilar opacification concerning for pneumonia or aspiration . Patchy left basilar opacity appears similar compared to the previous exam , which could also reflect an additional area of infection , aspiration , or atelectasis .