NCIt definition : A tumor mass composed of myeloblasts or immature myeloid cells. It occurs in extramedullary
sites or the bone. (WHO, 2001);
Alternative definition : NCI-GLOSS: A malignant, green-colored tumor of myeloid cells (a type of immature white
blood cell). This tumor is usually associated with myelogenous leukemia.; CDISC: A malignant neoplasm composed of myeloblasts or immature myeloid cells. It
occurs in extramedullary sites or the bone.;