Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right hemidiaphragm is elevated , which is chronic since ___ . There is mild atelectasis at the left lung base . There is no pleural effusion or pulmonary edema . Cardiomediastinal and hilar silhouettes are normal size .
    OUTPUT:
    
There is no pleural effusion . Chronically elevated right hemidiaphragm may explain the reduced breath sounds at the right lung base .