Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouettes are within normal limits . Aortic arch calcifications are noted . Both hila are unremarkable . Heterogeneous peribronchial airspace opacity at both lung bases , right greater than left could be atelectasis , however developing pneumonia or sequelae of aspiration is a consideration in the correct clinical setting . There is no evidence of pulmonary vascular congestion . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Possible aspiration or early pneumonia , both lung bases , right greater than left . Heart size normal . No pulmonary edema .