Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of this semi-upright patient demonstrates low lung volumes accentuating bronchovascular crowding . There appears to be increased mild perihilar vascular congestion without frank edema . A rounded density in the right cardiophrenic angle may corresponding to a pulmonary mass in the right lung base is seen on same - day reference CT . The heart is normal in size . The thoracic aorta is mildly unfolded . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
1 . Mild pulmonary vascular congestion . 2 . Right lower lobe lung mass is better demonstrated on accompanying reference CT . 3 . Low lung volumes .