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Pathohistological and immunohistochemical studies on Castleman's disease of the lymph node
Insights
Castleman
Area of Science:
- Pathology
- Immunohistochemistry
- Oncology
Background:
- Castleman's disease is a rare lymphoproliferative disorder.
- Histological features are crucial for diagnosis and subtyping.
- Understanding pathogenesis may reveal therapeutic targets.
Purpose of the Study:
- To characterize histological and immunohistochemical findings in Castleman's disease.
- To identify diagnostic criteria for the plasma cell type.
- To investigate potential associations with other neoplasms.
Main Methods:
- Histological examination of lymph nodes from 9 Castleman's disease cases.
- Immunohistochemical staining for factor VIII and immunoglobulin light chains.
- Analysis of cellular morphology and proliferation patterns.
Main Results:
- All cases showed whorled follicle centers and vascular proliferation.
- Factor VIII-positive cells identified in whorled structures.
- Monoclonal plasma cell proliferation and cellular atypia observed in plasma cell type.
- Association with Kaposi's sarcoma suggested in one hyaline-vascular type case.
Conclusions:
- Whorled follicle centers and vascular proliferation are key diagnostic features.
- Extramedullary plasmacytoma can occur in both solitary and multicentric Castleman's disease.
- An abnormal immune state may contribute to Castleman's disease pathogenesis.
Abstract:
Histological and immunohistochemical examinations were carried out on lymph nodes in 9 cases with Castleman's disease. In all cases, there were whorled follicle centers and proliferation of blood vessels. These findings were also considered to be important criteria for diagnosis of the plasma cell type of this disease. The whorled follicle centers often consisted of smaller concentrical structures and contained factor VIII-positive cells. In some cases, there were many small whorled structures surrounding postcapillary venules within the interfollicular areas of lymph nodes. These structures had factor VIII-positive granules indicating their endothelial origin. In 2 cases of the plasma cell type, monoclonal plasma cell proliferation (IgA, lambda and IgG, lambda, respectively) and cellular atypia were identified. These findings showed that extramedullary plasmacytoma could occur not only in the multicentric form, but also in the solitary form of Castleman's disease. In the lymph node of a case of the hyaline-vascular type, there were scattered tumour nodules consisting mainly of factor VIII-positive, atypical spindle cells suggesting associated Kaposi's sarcoma. It is conceivable that an abnormal immune state plays a role in pathogenesis of Castleman's disease.