<prompt> All are examples of malignant disorders causing myelofibrosis except ?Chronic myelogenous leukemiaHairy cell leukemiaHodgkins diseasePNH  <response>: Disorders Causing Myelofibrosis Acute leukemia lymphocytic, myelogenous, megakaryocytic Chronic myelogenous leukemia Hairy cell leukemia Hodgkins disease Idiopathic myelofibrosis Lymphoma Multiple myeloma Myelodysplasia Polycythemia vera Systemic mastocytosis Ref: Harrison, E-18,P-905. 