Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright chest radiograph provided . Midline sternotomy wires are noted . An NG tube courses into the left upper abdomen , though its tip is excluded from view . The endotracheal tube is seen with its tip residing approximately 3 .5 cm above the carina . The heart is mildly enlarged . There is mild lower lobe opacity , which could represent atelectasis or aspiration . Small bilateral effusions difficult to exclude . No definite bony abnormalities .
    OUTPUT:
    
Tubes and lines positioned appropriately . Mild cardiomegaly with probable small effusions and lower lobe opacities , likely atelectasis or aspiration related .