Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right lung base is poorly assessed due to obscuration by atelectasis and effusion . Small bilateral pleural effusions are as on the prior study . The heart is top normal in size with normal cardiomediastinal silhouette . Apparent enlargment of the left hilus as on the prior study is likely due to a grouping of left pulmonary veins .
    OUTPUT:
    
Small bilateral pleural effusions and bibasilar atelectasis . Incompletely assessed right lung base can be further evaluated by CT if of clinical concern .