Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left pectoral single lead pacemaker partially obscures the left mid lung . The chin and associated soft tissues partially obscures the lung apices . Suboptimal aeration of the left lower lobe may be due to overlaying soft tissue , but there may be a component of atelectasis or aspiration . The right lung is clear . There is no pneumothorax . The bones are diffusely osteopenic . Dense vascular calcifications are incidentally noted .
    OUTPUT:
    
Possible left lower lobe atelectasis or aspiration . A repeat PA and lateral radiograph would be helpful .