Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the prior exam , the lung volumes have improved . There is persistent linear opacification at the right base , most consistent with atelectasis . There is no evidence of pneumonia , pulmonary edema , a pleural effusion , or a pneumothorax . The mediastinal contours are normal . The heart size is at the upper limits of normal .
    OUTPUT:
    
No acute cardiopulmonary process .