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Thymoma with pseudosarcomatous stroma.

T W Noh1, S H Kim, B J Lim

  • 1Department of Pathology, Yonsei University College of Medicine, C.P.O. Box 8044, Seoul 120-752, Korea.

Yonsei Medical Journal
|October 25, 2001
PubMed
Summary
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This study reports a rare thymoma variant with pseudosarcomatous stroma in a 53-year-old man. The case highlights a distinct organotypic thymoma with cortical differentiation and a cellular stroma, showing a benign clinical course.

Area of Science:

  • Pathology
  • Oncology
  • Histology

Background:

  • Thymomas are neoplasms of the thymus gland.
  • Thymoma with pseudosarcomatous stroma is a rare variant characterized by epithelial and spindle cell components.
  • Only 11 cases have been previously reported worldwide.

Observation:

  • A 53-year-old Korean man presented with coughing and an anterior mediastinal mass.
  • Radiographic detection revealed a large, cystic mass.
  • Histological examination showed a biphasic neoplasm with epithelial and spindle stromal cells, exhibiting degenerative changes.

Findings:

  • Immunohistochemistry confirmed epithelial markers in the epithelial component and no expression in spindle cells.
  • Ultrastructural examination revealed tonofilaments in spindle cells, suggesting epithelial differentiation.

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  • The patient remained disease-free for 5 years post-surgery, with no myasthenia gravis.

    • Implications:

    • This case supports thymoma with pseudosarcomatous stroma as a distinct entity.
    • The findings suggest cortical differentiation and abundant cellular stroma.
    • The benign clinical course, typical for this variant, was observed.