Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The tips of the costophrenic angles are excluded from the study . The heart size is top normal . The hilar and mediastinal contours are within normal limits . There is no pneumothorax , focal consolidation , or pleural effusion . Linear bibasilar atelectasis is present . Slight focal right upper zone pleural thickening is unchanged , likely reflecting mild scarring .
    OUTPUT:
    
No acute intrathoracic process .