Micronodular thymic carcinoma with lymphoid hyperplasia: a clinicopathological and immunohistochemical study of five cases
Modern Pathology, ISSN: 0893-3952, Vol: 25, Issue: 7, Page: 993-999
2012
- 48Citations
- 23Captures
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Metrics Details
- Citations48
- Citation Indexes48
- 48
- CrossRef40
- Captures23
- Readers23
- 23
Article Description
Five cases of an unusual variant of thymic carcinoma are described, which represent the counterpart of the so-called micronodular thymoma with lymphoid hyperplasia. The patients were three men and two women aged 42–78 years (mean 64 years). Three patients were asymptomatic and the tumors were found incidentally on chest radiographs performed for unrelated reasons. Two patients complained of dyspnea, chest pain and shortness of breath prompting further investigations. The tumors ranged in size from 3.2 to 10.0 cm and were described as infiltrative masses often invading adjacent structures. Prominent cystic changes were not identified. Histologically, the neoplasms were composed of epithelial tumor cells arranged in a micronodular growth pattern set in a stroma showing florid lymphoid hyperplasia. Contrary to micronodular thymoma, the epithelial cell component of the present cases showed unequivocal signs of malignancy characterized by cytological atypia and increased mitotic activity. Immunohistochemical studies showed the lymphoid component to be of mixed B- and T-cell lineage. None of the patients had a history of myasthenia gravis or other autoimmune disorder. Follow-up revealed that 4 patients were alive and well 3–26 months after diagnosis while 1 patient was dead of disease 21 months after diagnosis. The tumors in this series represent a distinct subtype of thymic carcinoma histologically strongly resembling micronodular thymoma with lymphoid hyperplasia. Awareness of this type of thymic carcinoma is important in order not to dismiss this tumor for a neoplasm of lower-grade malignancy.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0893395222017070; http://dx.doi.org/10.1038/modpathol.2012.40; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84863463998&origin=inward; http://www.ncbi.nlm.nih.gov/pubmed/22388764; https://linkinghub.elsevier.com/retrieve/pii/S0893395222017070; https://dx.doi.org/10.1038/modpathol.2012.40
Elsevier BV
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