Monocytic leukemia is a type of myeloid leukemia

Myeloid leukemia

Myeloid leukemia is a type of leukemia affecting myeloid tissue.Types include:* Acute myeloid leukemia* Chronic myelogenous leukemia...

 characterized by a dominance of monocyte

Monocyte

Monocytes are a type of white blood cell and are part of the innate immune system of vertebrates including all mammals , birds, reptiles, and fish. Monocytes play multiple roles in immune function...

s in the marrow

Bone marrow

Bone marrow is the flexible tissue found in the interior of bones. In humans, bone marrow in large bones produces new blood cells. On average, bone marrow constitutes 4% of the total body mass of humans; in adults weighing 65 kg , bone marrow accounts for approximately 2.6 kg...

. When the monocytic cells are predominantly monoblast

Monoblast

Monoblasts are normally found in bone marrow and do not appear in the normal peripheral blood. They mature into monocytes which, in turn, develop into macrophages.-Structure:...

s, it is subclassified into monoblastic leukemia.

Like myeloid leukemia

Myeloid leukemia

Myeloid leukemia is a type of leukemia affecting myeloid tissue.Types include:* Acute myeloid leukemia* Chronic myelogenous leukemia...

, monocytic leukemia is almost always broken down into "acute" and "chronic":

• acute monocytic leukemia
  Acute monocytic leukemia
  Acute monocytic leukemia is considered a type of acute myeloid leukemia.-Diagnosis:In order to fulfill World Health Organization criteria for AML-5, a patient must have greater than 20% blasts in the bone marrow, and of these, greater than 80% must be of the monocytic lineage...
  
  
• chronic monocytic leukemia

Acute monocytic leukemia is far more commonly referenced than the chronic variety. However, the chronic variety is a valid diagnostic entry.