Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The hilar and mediastinal contours are unremarkable . Previously described left lower lung 9 - mm lung nodule is not well visualized on the prior exam . No focal consolidations concerning for infection , right pleural effusion , or pneumothoraces are identified . Minimal blunting of the left costophrenic angle may suggest a trace pleural effusion . There is mild stable biapical scarring , overall unchanged compared to the prior exam . There is also a cylindrical radiodense structure projecting over the right upper abdomen , likely external to the patient .
    OUTPUT:
    
1 . No evidence of cardiomegaly . 2 . Previously seen 9 - mm left lower lung nodule is not well visualized on the current exam . 3 . Mild left pleural effusion .