Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged . The aorta remains tortuous . Small hiatal hernia is noted . The pulmonary vasculature is normal . Minimal peripheral opacity is seen within the left mid lung field , a nonspecific finding . No pleural effusion or pneumothorax is seen . There are degenerative changes noted in the thoracic spine .
    OUTPUT:
    
Nonspecific focal peripheral opacity within the left mid lung field . This could reflect an area of infection or potentially infarction in the correct clinical setting .