Case contributed by Ammar Haouimi
Diagnosis almost certain



Patient Data

Age: 60 years
Gender: Male

Well-defined lobulated anterior mediastinal mass with moderate heterogeneous enhancement in contact with the ascending aorta and the auricle of the right atrium. No hilar or mediastinal lymphadenopathy. No pleural or pericardial effusion.

Both lungs are clear (lung window not shown).


CT-guided biopsy showing the needle within the mediastinal mass.

Case Discussion

The clinical presentation and the CT features are suggestive of thymoma, biopsy proven as thymoma type B1.

There are five main histologic subtypes of thymomas:

  1. type A: medullary thymoma

  2. type AB: mixed thymoma

  3. type B1: predominantly cortical thymoma

  4. type B2: cortical thymoma

  5. type B3: well-differentiated thymic carcinoma

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