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(a–c) In both true NK and NK like T cell lymphomas the defining cell type is very atypical with marked nuclear hyperchromasia. Angiocentricity of the infiltrate occurs and leads to tissue ischemia due to attenuation of the vascular lumen (a). The cells are strikingly CD56 positive (b). In the NK lymphomas positivity for EBER is not uncommon amidst the neoplastic T cells while in the NK/T cell lymphomas EBER positivity would be unusual (c)
