Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . The tripolar pacemaker is unchanged with leads extending to the region of the right atrium , right ventricle , and coronary sinus . The heart remains mildly enlarged . There is a small right pleural effusion . No definite signs of pulmonary edema or pneumonia . No pneumothorax is seen . The mediastinal contour is stable . Bony structures are intact .
    OUTPUT:
    
Small right pleural effusion , cardiomegaly , stably positioned tripolar pacemaker .