Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The previously described nodular opacity projecting over the anterior aspect of the right fourth rib is no longer present . The heart size is at the upper limits of normal . The mediastinal contours demonstrate a tortuous aorta . The lung volumes are low but clear of consolidation . There is no pleural effusion or pneumothorax . Degenerative changes are present in the thoracic spine .
    OUTPUT:
    
Nodular opacity in question is no longer present on current exam .