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Case of the Week 309 
What's the most likely diagnosis?
- 45 year-old with blurred vision
- Normal
- TB
- Pulmonary Laceration
- Thymoma
- Dissecting Aortic Aneurysm
Additional Images-Coronal and sagittal CT images of the thorax
Additional Images
Coronal and sagittal reconstructed CT images of the thorax
Answer:
4. Thymoma
More (Click Discussion Tab)
Thymoma
General Considerations
- Most common anterior mediastinal mass
- Accounts for 50% of anterior mediastinal masses and 25% of all mediastinal tumors
- Most are solid lymphoepithelial tumors of the thymus, some are cystic
- About 1/3 are malignant under 20 and over 40 years of age
- About half are malignant in those 20-40
- Rare in children — most common around 5th or 6th decade
- Mean age of 52
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