Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is diffuse ground glass and nodular opacity within the left lung which spares the apex , concerning for pneumonia or aspiration . Allowing for low lung volumes , the right lung is clear . There is no pleural effusion or pneumothorax . Allowing for differences in technique , the heart size is unchanged .
    OUTPUT:
    
Left lung nodular and ground - glass opacity concerning for aspiration or pneumonia .