Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bibasilar linear atelectasis is new . There are no other focal airspace opacities to suggest pneumonia . The cardiomediastinal silhouette has not significantly changed . Blunting of the left costophrenic sulcus suggests possible small left pleural effusion .
    OUTPUT:
    
1 . Bibasilar atelectasis and possible small left pleural effusion . 2 . Aspiration can not be excluded on this study . Portable AP radiograph does not optimally evaluate for aspiration ; a PA and lateral radiograph is recommended for further evaluation .