Primary myelofibrosis

A rare myeloproliferative neoplasm characterized by stem-cell derived clonal over proliferation of mature myeloid lineages, such as erythrocytes, leukocytes, and megakaryocytes, with variable degrees of megakaryocyte atypia, associated with reticulin and/or collagen bone marrow fibrosis, osteosclerosis, ineffective erythropoiesis, angiogenesis, extramedullary hematopoiesis, and abnormal cytokine expression.

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PMID (PMCID)
24880208
FEMALE
Papillary muscle rupture associated to essential thrombocytosis.
Avegliano G, Conde D, Battioni L, Kuschnir P, Castro F, Ronderos R.
Am J Emerg Med. 2014;32(12):1556.e1-2.
Essential thrombocytosis (ET) falls under the umbrella of myeloproliferative disorders, which also includes chronic myelogenous leukemia, polycythemia vera, and myelofibrosis with myeloid metaplasia.