Myeloblastoma Introduction Granulocytic leukemia is the neoplastic proliferation of granulocytes originating in the bone marrow. Infrequently, granulocytic leukemia in mammals is associated with the formation of sarcomatous tissue masses called chloromas. These neoplastic tissue masses usually arise in visceral organs. Similar hematopoietic neoplasms in birds are known by the synonyms granulocytic sarcoma, myelocytoma, or myeloblastoma. These neoplasms are associated with the proliferation of heterophils and their precursors, which lack myeloperoxidase.
Granulocytic sarcoma is relatively common in domestic fowls but is rare in exotic birds.
The purpose of this case report is to describe a granulocytic sarcoma in a Budgerigar. The bird died a few days after admission despite supportive treatment. Necropsy examination of the animal revealed a large, cystic, perihepatic mass. Cytoplasmic granules appeared red and slightly elongate, suggesting heterophilc cell lineage. The neoplasm also contained numerous variably sized and shaped vascular spaces.