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Open Access Acquired Amegakaryocytic Thrombocytopenia Purpura in a Rhesus Macaque (Macaca mulatta)

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A 10-y-old multiparous rhesus macaque presented for an annual routine physical examination. Clinically, the animal had pale mucous membranes, petechial and ecchymotic hemorrhages in multiple sites, and a laceration at the tail base. Severe pancytopenia was noted on hematologic evaluation. The monkey was seronegative for SIV, simian T-lymphotropic virus, simian retrovirus type D, and Macacine herpesvirus 1. Bone marrow evaluation revealed a paucity of megakaryocytic precursors in a hypercellular marrow with marked erythroid hyperplasia. In light of these findings, the diagnosis was acquired amegakaryocytic thrombocytopenia purpura. Due to the poor prognosis of the syndrome and clinical deterioration of the monkey, euthanasia was elected. A definitive cause of the thrombocytopenia was not identified; however, the syndrome may have developed secondary to a recent spontaneous abortion. To our knowledge, this case represents the first reported observation of acquired amegakaryocytic thrombocytopenia purpura in a rhesus monkey.

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Document Type: Case Report

Affiliations: Department of Veterinary Sciences, Michale E Keeling Center for Comparative Medicine and Research, MD Anderson Cancer Center, Bastrop, Texas, USA

Publication date: 2012-06-01

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  • Comparative Medicine (CM), an international journal of comparative and experimental medicine, is the leading English-language publication in the field and is ranked by the Science Citation Index in the upper third of all scientific journals. The mission of CM is to disseminate high-quality, peer-reviewed information that expands biomedical knowledge and promotes human and animal health through the study of laboratory animal disease, animal models of disease, and basic biologic mechanisms related to disease in people and animals.

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