Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly is unchanged . Mediastinal and hilar contours are stable . There is no pulmonary vascular congestion . Apart from mild bibasilar atelectasis , remainder lungs are clear without focal consolidation . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild bibasilar atelectasis .