Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild elevation of the left hemidiaphragm , which is similar to prior , though partially obscures the left lung base . A small opacity in this region could be missed . Lungs appear clear without confluent consolidation . There is no pulmonary edema or pleural effusions . Mediastinal and hilar contours are within normal limits .
    OUTPUT:
    
No acute cardiopulmonary process .