Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right pulmonary arterial catheter is unchanged in position from yesterday morning , likely terminating within the main pulmonary artery . The left pectoral pacemaker with leads terminating in the right atrium and through the coronary sinus is unchanged . The degree of cardiac silhouette enlargement is similar to ___ . There is no pleural effusion , pneumothorax or focal airspace consolidation worrisome for pneumonia . No pulmonary edema . Mediastinal and hilar structures are unremarkable .
    OUTPUT:
    
Unchanged position of the pulmonary arterial catheter . Lungs clear