[Reversed C.P.C.: Aggressive NK-cell leukemia/lymphoma]

While natural killer(NK)-cell type granular lymphocyte-proliferative disorders(GLPD) generally represent benign disorders, acute NK-cell leukemia/lymphoma is a rare but a very aggressive disorder. We report a case characterized by an extranodal(nasal) and bone marrow infiltration of large granular lymphocyte morphology, CD3-CD16-CD56+ phenotype. The patient's course became severe and refractory. Multiorgan failure, associated with intravascular coagulation syndrome was the main cause of death.