Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrates no focal opacity convincing for pneumonia . Cardiomediastinal and hilar contours are stable in appearance when compared to prior study dated ___ . The leads of a right pectoral pacemaker are unchanged in course for at least a year . Heavy mitral annulus calcification is chronic . When compared to most recent study dated ___ , there has been interval removal of a right internal jugular central catheter . There is no pleural effusion . Vascular clips denote prior upper abdominal surgery .
    OUTPUT:
    
No evidence of intrathoracic infection or malignancy .