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Mediastinal lymphoblastic lymphoma with non-lymphoblastic histologic features
J T Manning1, W C Pugh, A el-Naggar
1University of Texas M. D. Anderson Cancer Center, Houston.
Insights
This case study highlights a mediastinal lymphoma misclassified by initial histology. Advanced immunophenotyping revealed it as lymphoblastic lymphoma, emphasizing limitations in purely histologic diagnosis.
Area of Science:
- Oncology
- Hematology
- Pathology
Background:
- Mediastinal lymphomas present diagnostic challenges.
- Accurate classification is crucial for effective treatment and prognosis.
Observation:
- A 46-year-old male presented with mediastinal lymphoma.
- Initial histology suggested diffuse, non-large cell lymphoma, specifically diffuse small-cleaved cell lymphoma.
- Immunohistology and cell surface marker analysis indicated a common thymocytic phenotype (CD3, CD1a, CD4, CD8, TdT positive).
- DNA flow cytometry showed a high S+G2 M fraction (29%).
Findings:
- The immunophenotype was definitive for lymphoblastic lymphoma.
- Retrospective histologic reassessment revealed no cells with typical lymphoblast nuclear features.
- This indicates that lymphoblastic lymphoma can occasionally evade diagnosis based solely on conventional histology.
Implications:
- Histologic criteria alone may be insufficient for diagnosing all cases of lymphoblastic lymphoma.
- Immunophenotyping and DNA flow cytometry are essential adjuncts for accurate classification.
- This case underscores the importance of integrating multiple diagnostic modalities in lymphoma assessment.
Abstract:
The clinical and pathologic features of an unusual case of mediastinal lymphoma in a 46-yr-old man are presented. Histology of the tumor was that of a diffuse, non-large cell lymphoma. The nuclear chromatin was coarse, suggesting a relatively mature stage of lymphocyte maturation, and the lymphoma was provisionally classified as diffuse small-cleaved cell lymphoma. Immunohistologic study and cell surface marker analysis revealed a common thymocytic phenotype (CD3, CD1a, CD4, CD8, and TdT positive), however, and DNA flow cytometric analysis revealed a high S+G2 M fraction of 29%. With the immunostaining profile accepted as definitive for lymphoblastic lymphoma, histologic features were reassessed in retrospect. Cells having nuclear features typical of lymphoblasts were not recognized. Occasional cases of lymphoblastic lymphoma may not be recognizable when evaluated only by histology using the generally accepted criteria for diagnosis.
