Myelofibrosis (MF) is a rare disorder that classified as one of the myeloproliferative disorders. It BCR-ABL1- negative neoplasm characterized by abnormal proliferation hemopoietic stem cells within bone marrow, which leads to overproduction fibrous tissue. Our patient young girl 17 year old presented with lump in left upper abdomen, shortness breath & generalized swelling. The diagnosis wa...