Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Elevation of the right hemidiaphragm is chronic . The cardiac , mediastinal and hilar contours are unchanged with similar postradiation paramediastinal changes . Mild atelectasis is noted within the right lung base . The left lung is clear . Blunting of the left costophrenic angle posteriorly is unchanged , and likely reflects chronic pleural thickening . No pulmonary edema or pneumothorax is seen . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process . Chronic elevation of the right right hemidiaphragm and unchanged blunting of the left costophrenic sulcus suggestive of chronic pleural thickening .