title: "Almost bleeding to death": the conundrum of acquired amegakaryocytic thrombocytopenia.
abstract: Acquired amegakaryocytic thrombocytopenia (AAT) is a rare hematological disorder causing severe thrombocytopenia and bleeding. Previous in vitro studies postulated both cell-mediated suppression of megakaryocytopoiesis in early megakaryocytic progenitor cells and humoral-mediated suppression by anti-thrombopoietin antibodies as possible etiologies of AAT. Patients with AAT usually present with severe bleeding and thrombocytopenia that is unresponsive to steroids and intravenous immunoglobulin (IVIG). Although standard guidelines have not been established for management of AAT, a few case reports have indicated a response to immunosuppressive treatment. The prompt recognition of this disease entity is essential in view of the substantial risk of morbidity and mortality from excessive bleeding. We report a case of AAT successfully treated with equine antithymocyte globulin (ATG) and cyclosporine (CSP).
authors.affiliation: University of Arizona College of Medicine, 1501 North Campbell Avenue, Tucson, AZ 85724, USA.
authors.forename: Gabrielle Elena
authors.initials: GE
authors.lastname: Brown
authors.affiliation: Division of Hematology-Oncology, Department of Medicine, University of Arizona College of Medicine, 1501 North Campbell Avenue, Tucson, AZ 85724, USA ; University of Arizona Cancer Center, 1515 North Campbell Avenue, Tucson, AZ 85724, USA.
authors.forename: Hani M
authors.initials: HM
authors.lastname: Babiker
authors.affiliation: Department of Pathology, University of Arizona College of Medicine, 1501 North Campbell Avenue, Tucson, AZ 85724, USA.
authors.forename: Carlos L
authors.initials: CL
authors.lastname: Cantu
authors.affiliation: Division of Hematology-Oncology, Department of Medicine, University of Arizona College of Medicine, 1501 North Campbell Avenue, Tucson, AZ 85724, USA ; University of Arizona Cancer Center, 1515 North Campbell Avenue, Tucson, AZ 85724, USA ; Department of Pediatrics, University of Arizona College of Medicine, 1501 North Campbell Avenue, Tucson, AZ 85724, USA.
authors.forename: Andrew M
authors.initials: AM
authors.lastname: Yeager
authors.affiliation: Division of Hematology-Oncology, Department of Medicine, University of Arizona College of Medicine, 1501 North Campbell Avenue, Tucson, AZ 85724, USA ; University of Arizona Cancer Center, 1515 North Campbell Avenue, Tucson, AZ 85724, USA.
authors.forename: Ravitharan
authors.initials: R
authors.lastname: Krishnadasan