Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left PICC terminates in the low superior vena cava . The distal neo esophagus contains residual oral contrast along its posterior wall . The anterior tracheal wall has a trace amount of barium . There is no pleural effusion . Bilateral diffuse opacities and prominent interstitial markings of the mid to upper lungs are unchanged . Retrosternal lucency on lateral projection corresponds to area question pneumomediastinum on prior CT . Comparison is difficult due to differences in technique , however the volume of air is grossly unchanged .
    OUTPUT:
    
1 . Findings of the retrosternal air on lateral projection is unchanged compared to CT ___ , accounting for differences in technique . 2 . Unchanged bilateral mid to upper lung opacities and prominent interstitial markings .