CD3+ CD56+ EBER1+ atypical extraosseous plasmacytoma of the nasal cavity
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We present a case of atypical extraosseous plasmacytoma (EP) with a plasmablastic morphology and CD3+ CD56+ Epstein–Barr virus-encoded RNA-1 (EBER1)+ phenotypes of the nasal cavity. A 51-year-old male attended a local hospital with a tumor located in his left nasal cavity that was histologically diagnosed as extranodal NK/T cell lymphoma, nasal type. We reviewed the specimens and re-biopsied the tumor, and confirmed that the tumor was positive for CD3, CD56, and EBER1; however, the tumor showed a plasmablastic morphology without necrosis and angiocentricity, and was positive for CD138, but negative for CD20 and PAX5. Given a plasmablastic morphology and EBER1 positivity, but a relatively low Ki67 index (30%), we diagnosed the case as atypical EP. The CHOP regimen was administered and complete remission achieved. This case indicated that EP should be considered as a differential diagnosis even when a tumor shows large cell morphology and is positive for CD3, CD56, and EBER1.
KeywordsCD3 CD56 Epstein–Barr virus Nasal cavity Plasmacytoma
This work was supported in part by the Japan Agency for Medical Research and Development Fund (17ck0106349s0201) in Japan.
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Conflict of interest
The authors declare that they have no competing interests.
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