Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . AICD is unchanged in position with leads extending to the region the right atrium and right ventricle . Midline sternotomy wires and mediastinal clips are again noted . Lung volumes are low . Crowding of bronchovascular markings in the lower lungs likely accounts for the subtle opacities noted , unchanged significantly from prior . Difficult to exclude mild bibasilar atelectasis or a component of mild aspiration / PNA . The heart remains mildly enlarged . Mediastinal contour is normal . No large effusion or pneumothorax .
    OUTPUT:
    
Mild bibasilar opacities likely bronchovascular crowding , atelectasis , less likely aspiration / pneumonia . Mild cardiomegaly again seen .