Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright view of the chest provided . There is no focal consolidation , effusion , or pneumothorax . Mild cardiomegaly is similar to prior . Persistent widening of the mediastinum indents the trachea , pushing it to the left . No free air below the right hemidiaphragm is seen . Aortic calcifications are similar to prior . Mild scoliosis is similar to prior .
    OUTPUT:
    
1 . Persistent widening of the mediastinum could be due to an enlarged thyroid , but other masses in the mediastinum are not excluded . 2 . No acute intrathoracic process .