College of American Pathologists

2011 — June Case of the Month

Posted June 17, 2011


CAP Foundation April 2011 Online Case of the Month

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A 55-year-old man, with a history of myasthenia gravis for two years, presented with an anterior mediastinal mass, recently noted on CT scan. Grossly, the thymus is 118 g, 12.0 x 10.0 x 2.5 cm and shows an encapsulated, nodular, tan-white, firm cut surface.

The master list with the correct answer

  • Follicular hyperplasia
  • Hodgkin lymphoma
  • Lymphoepithelial thymoma
  • Mediastinal (thymic) large B-cell lymphoma
  • Seminoma
  • Spindle cell thymoma
  • Thymic carcinoma

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  • Appropriate diagnosis
  • Critique
  • References

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