Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is top normal . Mediastinal and hilar contours are unchanged with prominence of the right upper mediastinal contour likely due to the presence of a known thyroid goiter . Pulmonary vasculature is not engorged . Small left pleural effusion appears slightly improved with mild adjacent atelectasis . There is no focal consolidation , right pleural effusion or pneumothorax . Mild degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
Slightly decreased size of small left pleural effusion with adjacent left basilar atelectasis .