Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right approach Port - A - Cath terminates at the cavoatrial junction . There is a triangular opacity within the right middle lobe which corresponds to progressive right middle lobe collapse , better characterized on concurrent CT of the chest . A known infiltrative right middle lobe mass is obscured by the progressive lobar atelectasis . Paramediastinal density in the region of the right hilum is partly related to post-radiation change , though is increased secondary to probable superimposed consolidation . The left lung appears clear . There is no pneumothorax . There is a small right pleural effusion .
    OUTPUT:
    
1 . Progressive right middle lobe collapse in a patient with a known infiltrative right middle lobe lung carcinoma 2 . Increasing right hilar opacity secondary to probable superimposed infection , better characterized on concurrent CT . 3 . Small right pleural effusion