Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right Port - A - Cath terminates in the low SVC . Mediastinal contours , hila , and cardiac silhouette are normal . Opacity at the left lung base obscures the hemidiaphragm . Small left pleural effusion is new from ___ .
    OUTPUT:
    
1 . Opacity the left lung base could represent atelectasis or pneumonia . 2 . Small left pleural effusion new since ___ .