College of American Pathologists

2011 — January Case of the Month

Posted February 18, 2011


CAP Foundation January 2011 Online Case of the Month

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A 63-year-old man with history of smoking was found to have a 3.0 cm lung mass on imaging. There was no evidence of extrapulmonary disease. CT-guided FNA was inconclusive. A lobectomy specimen revealed a 3.2 x 3.0 x 3.0 cm tumor upon sectioning and the tumor cells were cytokeratin (+), chromogranin (+) and synaptophysin (+).

The master list with the correct answer

  • Atypical carcinoid
  • Primitive neuroectodermal tumor
  • Small cell carcinoma
  • Pancreatic pseudocyst
  • Squamous cell carcinoma, poorly differentiated
  • Typical carcinoid

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  • Appropriate diagnosis
  • Critique
  • References

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