Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no evidence of pneumothorax . There is a 2 .1 - cm mass seen within the right lower lobe . There is mild bilateral interstitial edema with moderate - to - severe cardiomegaly . There is no pleural effusion on the right . A pleural effusion on the left can not be excluded due to the cardiomegaly .
    OUTPUT:
    
No evidence of pneumothorax .