Fig. 3From: Aggressive natural killer cell leukemia or extranodal NK/T cell lymphoma? a case with nasal involvementThe pathological findings of the tissue. a HE staining, ×400. The tissue was identified as nasal mucosa and coagulative necrosis with infiltrating monomorphic medium-sized lymphoid cells. b, c, d Immunohistochemically, the neoplastic cells were CD56+ and perforin+, and is approximately 80% of the cells were Ki-67-positiveBack to article page