Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Stable mild right sided tracheal deviation from left lobe thyroid enlargement as seen on CT chest . Lungs clear bilaterally without pleural effusion or pneumothorax . Mild stable chronic left hemidiaphragm elevation . Heart size , mediastinal contour and hila are otherwise normal .
    OUTPUT:
    
No radiographic evidence of pneumonia .