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  • Title: Gelatinous bone marrow transformation in a case of idiopathic myelofibrosis: a morphological paradox.
    Author: Böhm J, Schmitt-Gräff A.
    Journal: Pathol Res Pract; 2000; 196(11):775-9. PubMed ID: 11186174.
    Abstract:
    A 74-year-old woman with severe, but asymptomatic weight loss was found to have splenomegaly, thrombocytosis, and neutrocytosis. A trephine biopsy showed a hypercellular bone marrow with a proliferation of abnormal megakaryocytes, mild reticulin fibrosis, and osteosclerosis, i.e., features of an early stage of idiopathic myelofibrosis. In contrast to this predominant pattern, the marrow also contained a distinct hypocellular focus of gelatinous transformation (GMT) in which hematopoietic and fat cells were replaced by gelatinous substances that were characterized as hyaluronic acid mucopolysaccharides histochemically. GMT is a rare disorder of unknown pathogenesis, and is an unspecific indicator of severe illness which most often occurs in patients with a background of weight loss. This is the first reported case of gelatinous changes in an otherwise fibrotic bone marrow, a constellation which a priori seemed to be incompatible.
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