Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low . Heart size is top normal , unchanged . Mild atherosclerotic calcification is noted at the aortic knob . Pulmonary vasculature is normal . Apart from subsegmental atelectasis in the lingula , the lungs are clear . No focal consolidation or pneumothorax is present . Minimal blunting of the costophrenic angles posteriorly on the lateral view may suggest the presence of trace bilateral pleural effusions . Mild degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
Possible trace bilateral pleural effusions and lingular subsegmental atelectasis .