Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Poor lung volumes account for vascular crowding . There are no focal opacities in the left lung . A rounded consolidation abutting the right hemidiaphragm is noted in the right lower lung region which is unchanged compared with prior CT and corresponds to known lung mass . There is no evidence of abdominal free air or pleural effusion . A subsequent chest CT demonstrated the presence of pneumothorax , which is poorly seen on this study .
    OUTPUT:
    
Right lower lobe mass unchanged from prior examination . Right pneumothorax is better seen on subsequent CT .