Granulocytic sarcoma (Myeloid sarcoma)

The freshly cut surface of these tumors often has a green tint due to high myeloperoxidase content of immature myeloid cells, hence they were referred to as Chloroma. The color readily fades from oxidation on exposure of tumor to air. Since one-third of these tumors have brown, white, or gray color, the term granulocytic sarcoma (or myeloid sarcoma) is considered more appropriate. The tumor shown here is composed of myeloblasts, megakaryocytes, eosinophilic myelocytes (with orange granules) and mature neutrophils.