1. Chest CT: Thymoma Robert A. Novelline, M.D. Scholar Professor of Radiology Massachusetts General Hospital Boston, MA.

2. Initial Chest Films

3. Initial CT Scan

4. Sagittal Reformations

5. Coronal Reformations

6. Post-Operative Chest Films

7. Comparison Pre and Post Op

8. CT of Thymoma Will appear as a smoothly margined, homogeneous, rounded or lobulated, soft tissue mass in the anterior mediastinum Mass is completely or partially outlined by fat density (fat planes separating mass from other mediastinal structures) Mass enhances homogeneously with IV contrast Areas of decreased attenuation may indicated cystic change or foci of hemorrhage or necrosis Calcifications may be seen in the mass Irregular margins and loss of fat plane suggest invasion Diff DX: lymphoma, teratoma, thyroid mass