Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a hazy opacity at the right lung base obscuring the right hemidiaphragm . The left lung base continues to be completely opacified and is largely unchanged from ___ . The lungs are otherwise clear . The endotracheal tube , nasogastric tube , and right PICC are in appropriate position and unchanged . There is no pneumothorax . The mild cardiomegaly is stable . The hilar and mediastinal contours are normal .
    OUTPUT:
    
Persistent loss of airspace at the bilateral lung bases raises concern for pneumonia . Less likely , this could represent continued pleural effusions and associated atelectasis , without an underlying infectious process .