All are true about thymus swelling except –
Widening of mediastinum on X–ray
Sharp border with sail like appearance
Steroid administration reduces size of swelling
Shift of trachea on X–ray
Thymic shadow does not indent tracheal shadow. A mediastinal shadow indenting tracheal shadow should always be evaluated for a significant pathology.
Thymic swelling may cause widening of anterior mediastinum. Thymic swelling causes a sail-shaped shadow. Thymic swelling may shrink with use of steroids.