Megaloblastic anemia
A cause of macrocytic anemia characterized by large immature RBC precursors (megaloblastoid RBC precursors) in the bone marrow that is the result of impairment in DNA synthesis during RBC production. Common causes include Vitamin B12 deficiency, folate deficiency, chemotherapy-induced (e.g. Methotrexate, 6-Mercaptopurine or Cytosine Arabinoside), and certain malignancies (e.g. MDS).