Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No lateral view was obtained on the ___ study . Allowing for this , the appearance on the frontal view is essentially unchanged . Again seen is an effusion at the right lung base , with underlying collapse and / or consolidation . The overall size of the opacity is similar to the prior study . Today 's lateral view shows fluid extending along the fissure anteriorly as well as a small effusion posteriorly . The right hemidiaphragm itself is mostly obscured . The cardiomediastinal silhouette is enlarged but unchanged . There is upper zone redistribution and very mild vascular plethora , without other evidence of CHF . In the left lung , no focal infiltrate or gross effusion is seen . Minimal blunting of the left posterior costophrenic angle could be present .
    OUTPUT:
    
Based on the frontal views , doubt significant interval change compared with ___ . Again seen is the effusion at the right lung base , with considerable obscuration of the right hemidiaphragm . Cardiomediastinal silhouette and mild vascular plethora are also not significantly changed .