[Prognostic value of bone and marrow lesions in primary myeloid splenomegaly].

The diagnosis of myelofibrosis depends on three fundamental criteria. Myeloid metaplasia of the liver and spleen, absence of Philadelphia chromosome and a variable degree of myelofibrosis. It is thus necessary to have available bone and marrow biopsies to make the diagnosis. The analysis of elementary lesions, together with their grouping, was at the origin of various pathological classifications, including those of Hickling and Jacquillat, Chom and Ripault. The latter, adopted by most authors, distinguishes three histological types, depending on the degree of myelofibrosis and bony sclerosis. They are usually considered as successive stages of the disease.