Correct!
5. All of the above

The mass is in the anterior mediastinum, that portion of the mediastinum anterior to the pericardium and below the level of the clavicles. In this case the mass is slightly to the left side. The differential is remembered by the 5 T's of an anterior mediastinal mass:

The mass was a thymoma which was resected followed with radiation therapy. She began having cough and dyspnea 1 to 2 months later and a repeat thoracic CT scan was performed (Figure 2).

Figure 2. Representative image of the repeat thoracic CT scan in lung windows performed about 4 months after resection of the patient's thymoma.

What is the most likely diagnosis? (Click on the correct answer to move to the third of four panels).

  1. Atypical pneumonia
  2. Community acquired pneumonia
  3. Cryptogenic organizing pneumonia
  4. Metastatic thymoma
  5. Radiation pneumonitis

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