Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left chest wall pacing device is again seen with leads in unchanged positions , 2 at the right ventricular apex and 1 in the right atrium . The lungs are clear without consolidation , effusion , edema or pneumothorax . There is a nodular opacity seen in the retrocardiac region on the lateral view just anterior to the the midportion of a lower thoracic vertebral body . It measures approximately 1 .5 cm and may localize to the left on the frontal view , abutting the cardiac margin . Cardiomediastinal silhouette is within normal limits . Coronary artery stent is noted . Hypertrophic changes are noted in the spine .
    OUTPUT:
    
No acute cardiopulmonary process , no pneumothorax . A 1 .5 cm nodule seen on the lateral view , likely within the left lung on the frontal view . Followup nonurgent chest CT is suggested .