College of American Pathologists

2010 — December Case of the Month

Posted January 07, 2011


CAP Foundation December 2010 Online Case of the Month

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A 50-year-old man presented with a persistent cough refractory to antibiotic therapy. Chest x-ray revealed a 5.0 cm mass lesion with central cavitation. A PPD was negative. Biopsy attempts were non-diagnostic, and the mass was eventually resected given a high clinical and radiographic suspicion of malignancy. The lobectomy specimen revealed a cavitary mass with a mixed fibrotic and gelatinous cut surface.

The master list with the correct answer

  • Clear cell tumor of the lung
  • Inflammatory myofibroblastic tumor
  • Malakoplakia
  • Metastatic renal cell carcinoma
  • Mycobacterial pseudotumor
  • Pulmonary cryptococcosis

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  • Appropriate diagnosis
  • Critique
  • References

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