What is (are) Primary Myelofibrosis ?
Key Points
                    - Primary myelofibrosis is a disease in which abnormal blood cells and fibers build up inside the bone marrow.    - Symptoms of primary myelofibrosis include pain below the ribs on the left side and feeling very tired.    - Certain factors affect prognosis (chance of recovery) and treatment options for primary myelofibrosis.
                
                
                    Primary myelofibrosis is a disease in which abnormal blood cells and fibers build up inside the bone marrow.
                    The bone marrow is made of tissues that make blood cells (red blood cells, white blood cells, and platelets) and a web of fibers that support the blood-forming tissues. In primary myelofibrosis (also called chronic idiopathic myelofibrosis), large numbers of blood stem cells become blood cells that do not mature properly (blasts). The web of fibers inside the bone marrow also becomes very thick (like scar tissue) and slows the blood-forming tissues ability to make blood cells. This causes the blood-forming tissues to make fewer and fewer blood cells. In order to make up for the low number of blood cells made in the bone marrow, the liver and spleen begin to make the blood cells.