Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Ill - defined airspace opacity in the infrahilar right lung may represent atelectasis or pneumonia , depending upon the clinical circumstances . There is no pulmonary edema , pleural effusion , or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
Ill - defined airspace opacity in the right infrahilar region may represent atelectasis or early pneumonia .