Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a hazy ground glass opacity in the left mid and lower lung zones , which given the clinical history , may represent aspiration , less likely asymmetric pulmonary edema . The right lung is clear . There is no pleural effusion , or pneumothorax . The cardiomediastinal silhouette is normal . No fracture is identified
    OUTPUT:
    
Asymmetric left perihilar ground - glass opacity likely aspiration though can not exclude asymmetric pulmonary edema .