College of American Pathologists

2011 — April Case of the Month

Posted April 22, 2011


CAP Foundation April 2011 Online Case of the Month

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Imaging studies revealed multiple lung nodules in a 42-year-old man. Received was an 8.7 x 3.0 x 2.5 cm wedge biopsy of peripheral lung tissue containing a 2.5 cm tumor mass. Flow cytometry revealed a monotypic kappa restricted B cell population lacking expression of CD5, CD10, or CD23.

The master list with the correct answer

  • Extranodal marginal zone lymphoma, MALT type
  • Follicular bronchiolitis
  • Lymphoid interstitial pneumonia
  • Mantle cell lymphoma
  • Florid Reactive Follicular lymphoid hyperplasia
  • Small lymphocytic lymphoma

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  • Appropriate diagnosis
  • Critique
  • References

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