What are myelodysplasia and pulmonary fibrosis?

Different things: When the bone marrow fails and is replaced with fibrosis it fails to produce normal blood cells and anemia and impaired immune response are the result. Pulmonary fibrosis is replacement of lung tissue with scar tissue. The two are unrelated diseases.

Myelodysplasia...: and myelofibrosis are both diseases of the bone marrow that impair normal red and white blood cell production. Like the leukemias they occur as a result of mutations in bone marrow stem cells that occur during your lifetime. Despite a similar sounding name, pulmonary fibrosis is an unrelated disease resulting in scarred lung tissue and impaired breathing function.