College of American Pathologists

2011 — August Case of the Month

Posted August 23, 2011

CLINICAL SUMMARY: Mediastinum, posterior  

CAP Foundation August 2011 Online Case of the Month

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A 32-year-old man with no significant previous medical history presented with sweating, headaches, and palpitations. A CT scan revealed a mass in his posterior mediastinum. Grossly, the 125 g mass measured 7.9 x 6.5 x 5.3 cm and was partially encapsulated with a deep red to pink cut surface. Sectioning revealed a single 3.1 cm cyst filled with serosanguinous fluid surrounded by red-pink, soft parenchyma.

The master list with the correct answer

  • Angiosarcoma
  • Medullary carcinoma
  • Metastatic lung adenocarcinoma
  • Metastatic renal cell carcinoma
  • Paraganglioma
  • Thymic carcinoid

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  • Appropriate diagnosis
  • Critique
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