Chronic Myeloid Leukemia: Chronic Phase Presenting as Extramedullary Presentation

Chronic myeloid leukemia (CML) is a myeloproliferative disorder characterized by immature granulocytes in the peripheral blood and bone marrow. In 95% of cases, it is always associated with the presence of the Philadelphia chromosome, which is characterized by the presence of reciprocal translocation between chromosomes 9 and 22. However, 3.1-9.1% of patients also have an extramedullary proliferation of skin, lymph nodes, bone, or central nervous system (CNS), which could be either myeloid, lymphocytic, or mixed lineage in origin. An extramedullary myelogenous neoplasm termed myeloid sarcoma (MS) can originate from myeloblasts or immature myeloid cells. Due to the green, gross appearance caused by the myeloperoxidase enzyme in immature myeloid cells, it is also known as chloroma. According to WHO guidelines, it is a tumor composed of myeloid blasts, mature or immature. Here we report an old female patient with CML - chronic phase who came for imatinib therapy and presented as MS in the right parotid gland.