Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is increased cardiomegaly . A left - sided pacemaker is appreciated . There is mild vascular congestion . More confluent opacity is noted at the right lung base and could reflect edema although superimposed infection can not be excluded . There is no pneumothorax or effusion .
    OUTPUT:
    
Mild vascular congestion and marked cardiomegaly . More confluent opacity at the right lung base which could reflect edema although superimposed infection is not excluded .