Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single upright image of the chest demonstrates an elevated left hemidiaphragm with small left base opacification likely representing atelectasis . The lungs are otherwise clear . There is no pneumothorax or pleural effusion . Moderate cardiomegaly is seen . There is a minimally dilated aorta which follows a tortuous course compatible with the patient 's advanced age .
    OUTPUT:
    
Elevated left hemidiaphragm with some left lung base atelectasis . No evidence of pneumonia .