Retrotracheal thymoma masquerading as esophageal submucosal tumor

Figure 1 A: Barium esophagogram shows extraluminal compression and right side deviation of the upper esophagus (arrows); B: Enhanced CT scan at the level of the lower neck shows a mildly lobulated homogeneous mass (arrows) posterior to the trachea; C: T2 weighted sagittal MR image shows a slightly inhomogeneous, enlongated mass (arrows) with compression on the posterior wall of the trachea, mimicking an esophageal submucosal mass.