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WHO Classification of Tumours
Extranodal NK/T cell lymphoma, nasal type
Tumours of haematopoietic and lymphoid tissues


Definition

A predominantly extranodal lymphoma characterized by vascular damage and destruction, prominent necrosis, cytotoxic phenotype and association with Epstein-Barr virus (EBV). It is designated "NK/T" (instead of "NK"), because while most cases appear to be genuine NK-cell neoplasms, some cases show a cytotoxic T-cell phenotype.


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Introduction: Classification of lymphoid neoplasms