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Involution of the thymus: a possible diagnostic pitfall.

M Raica1, Anca Maria Cîmpean, Svetlana Encică

  • 1Department of Histology and Cytology, Victor Babeş University of Medicine and Pharmacy, 2 Eftimie Murgu Square, Timişoara. raica@umft.ro

Romanian Journal of Morphology and Embryology = Revue Roumaine De Morphologie Et Embryologie
|July 21, 2007
PubMed
Summary

Thymus involution, a normal aging process, shows distinct morphological and immunohistochemical changes. These changes, including lymphocyte depletion and epithelial cell alterations, can mimic thymoma or carcinoma.

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Area of Science:

  • Histopathology
  • Immunohistochemistry
  • Thymic Pathology

Background:

  • Thymus involution is an age-dependent process with characteristic morphological changes.
  • These changes can present diagnostic challenges, potentially mimicking neoplastic conditions.
  • Understanding involution is crucial for interpreting thymic pathology.

Purpose of the Study:

  • To investigate the morphological and immunohistochemical features of thymus involution.
  • To differentiate involutional changes from thymoma and metastatic carcinoma.
  • To correlate involutional changes with specific clinical conditions like myasthenia gravis and cardiovascular malformations.

Main Methods:

  • Histological examination of 22 thymic tissue samples.
  • Routine morphologic staining techniques.
  • Immunohistochemistry for cytokeratin, CD20, CD3, and S100 protein.

Main Results:

  • Thymus involution was observed in all myasthenia gravis cases and 11 non-myasthenia gravis cases.
  • Key involutional features include cortical-medullary inversion, lymphocyte depletion, and epithelial cell aggregation.
  • Immunohistochemistry revealed decreased cytokeratin expression and reduced numbers of CD3, CD20, and S100 positive cells.

Conclusions:

  • Thymus involution exhibits specific morphological and immunohistochemical profiles.
  • Advanced involutional changes can mimic thymoma or metastatic carcinoma, necessitating careful evaluation.
  • The observed changes are discussed in the context of thymic pathologies, including myasthenia gravis.