Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left PICC terminates in the lower SVC . Cardiomediastinal silhouette including moderate cardiomegaly is unchanged . There is increased density over the right base the lung markings only seen medially . This could represent a moderate pleural effusion and adjacent atelectasis ; however , right lower lobe collapse and eventration of right hemidiaphragm also possible . Atelectasis at the left base has decreased . Barium from a prior study is seen in the colon .
    OUTPUT:
    
1 . No substantial change in the right lower lung opacification which may be related to an moderate - sized effusion with adjacent atelectasis ; however , a collapsed right lower lobe can not be excluded . 2 . Improved atelectasis at the left base .