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Updated: Aug 16, 2026
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Published on: December 29, 2014
[Clinical pathological study of resected thymus from 104 myasthenia gravis patients]
Insights
Myasthenia gravis patients with thymic lymphoid hyperplasia, not thymomas, showed significant improvement after thymectomy. Prognosis depends on clinical type, age, and pathological thymus changes.
Area of Science:
- Immunology
- Pathology
- Oncology
Context:
- Myasthenia gravis is an autoimmune disorder affecting neuromuscular junctions.
- The thymus plays a crucial role in immune system development and is implicated in myasthenia gravis pathogenesis.
- Understanding thymic pathology is vital for predicting treatment outcomes.
Purpose:
- To investigate the clinical pathological manifestations of thymuses in myasthenia gravis patients.
- To correlate thymic pathological findings with clinical outcomes after thymectomy.
- To explore the utility of immunohistochemical and electron microscopy techniques in characterizing thymic changes.
Summary:
- Review of 104 thymuses revealed characteristic lymphocytic hyperplasia with germinal centers and capillary proliferation in myasthenia gravis.
- Immunohistochemistry and electron microscopy identified T and B cell proliferation and specific cellular projections.
- Prognosis after thymectomy is linked to clinical type, age, and pathological thymus features, with hyperplasia showing better outcomes than thymomas.
Impact:
- Identifies specific thymic pathological features associated with improved prognosis in myasthenia gravis.
- Highlights the importance of thymectomy for specific patient subgroups.
- Provides insights into the immunological basis of myasthenia gravis and thymic involvement.
Abstract:
One hundred and four thymuses from patients with myasthenia gravis were reviewed for clinical pathological manifestations. 6 cases were examined by immunohistochemical techniques with CK, EMA, CEA, UCHT1, T4, T8, L26, S-100 and electronmicroscopy. 73 cases had long term follow-up after thymectomy. Microscopically, there was lymphocytic hyperplasia associated with formation of germinal centers and branching proliferation of capillaries, which were characteristic. Electronmicroscopically there were abundant cytoplasmic projections of lymphocytes. Interdigitating pattern of the projections were frequently seen between the lymphocytes and crevice-like patterns were formed between the endothelial cells of capillaries. Immunohistochemically, the thymus had both proliferation of T cells (UCHT1, T4) and B cell reaction (L26) as well as CK and S-100 positive cell expression. It is suggested that the prognosis of myasthenia gravis after resection of thymus is related to clinical type, age and pathological changes. 95.1% of adult type I or II cases which were associated with hyperplasia of lymphoid tissue of the thymus, but not thymomas, improved after thymectomy and had better prognosis than others.
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