Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size normal . Abnormal left paramediastinal line at the level of the aortic arch and poor visualization of the aortic arch . Obliteration of the retrosternal space on the lateral radiograph ( may be seen in patients with increased BMI ) . No pulmonary edema . No airspace consolidation . No suspicious pulmonary nodules or masses . No pneumothorax . No pleural effusion . Spondylotic changes of the thoracic spine . Mild kyphotic deformity of the lower thoracic spine .
    OUTPUT:
    
No pneumonia . Radiographic findings concerning for an mediastinal abnormality .