label: cellular phase chronic idiopathic myelofibrosis
label_lc: cellular phase chronic idiopathic myelofibrosis
description: Primary myelofibrosis characterized by bone marrow hypercellularity and the presence of atypical megakaryocytes. There is no increase in the percentage of myeloblasts and no significant increase in reticulin or collagen fibrosis in the bone marrow.