Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since prior , there has been interval development of a moderate - sized right - sided pleural effusion . More focal opacity seen on the lateral view projecting over the spine is of uncertain etiology , potentially superimposed parenchymal consolidation or lesion . The left lung is clear without effusion . Cardiomediastinal silhouette is difficult to assess given silhouetting on the right . Atherosclerotic calcifications seen at the aortic arch . No acute osseous abnormalities . Flowing anterior osteophytes seen in the lower thoracic spine .
    OUTPUT:
    
Interval development of moderate right - sided pleural effusion since prior . Focal opacity projecting over the spine on the lateral view should be followed on subsequent exams .