SEER is an authoritative source of information on cancer incidence and survival in the United States. SEER currently collects and publishes cancer incidence and survival data from population-based cancer registries covering approximately 28 percent of the U.S. population.
Code grade specified by pathologist. If no grade specified, code 9
M3 Module 5: PH10
Extramedullary myeloid tumor
Tumor mass of myeloblasts or immature myeloid cells occurring in a site other than bone marrow. This is a solid tumor composed of immature malignant white blood cells called myeloblasts. A chloroma is an extremedullary manifestation of acute myeloid leukemia; in other words, it is a solid collection of leukemic cells occurring outside of the bone marrow.
Do not code primary site to C421 (bone marrow).
Almost any site in the body can be involved; the most frequently affected sites are: the skin, lymph nodes, gastrointestinal tract, bone, soft tissue and testis. Myeloid sarcoma may occur de novo; it may precede or coincide with AML, or represent acute blastic transformation of myelodysplastic syndromes. Myeloid sarcoma may also be the initial manifestation of relapse in a patient with previously diagnosed AML.