Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is borderline enlarged as on prior . The mediastinal and hilar silhouette is stable . There is chronic collapse of the right middle lobe . There is no pneumothorax or pleural effusion . A nodular opacity is noted in the left midlung . Other , smaller nodular opacities in the left midlung remained grossly unchanged in for the sequela of chronic MAC . Again noted is a dual lead pacemaker with the right atrial and ventricular leads in unchanged position .
    OUTPUT:
    
No definite acute process .