primary myeloid metaplasia

pri·mar·y my·e·loid met·a·pla·si·a

myeloid metaplasia occurring as the primary condition, often in association with myelofibrosis. Synonym(s): agnogenic myeloid metaplasia

chronic idiopathic myelofibrosis

A chronic progressive condition characterised by panmyelosis and variable marrow fibrosis, massive splenomegaly secondary to extramedullary haematopoiesis, and leukoerythroblastic anaemia with dysmorphic red blood cells, circulating normoblasts, immature white blood cells and atypical platelets.

Clinical findings
Patients are often > age 50, suffer from insidious weight loss, anaemia, and abdominal discomfort due to splenomegaly, often with hepatomegaly; 80% have nonspecific chromosome defects.

Diagnosis
Bone marrow biopsy.

Management
No specific therapy; packed RBCs for anaemia; androgens may reduce transfusion requirements, but are poorly tolerated in women; recombinant erythropoietin.

Prognosis
Survival ± 5 years, often progresses to acute leukaemia.
Terminology
No name used for this condition has proven consistently satisfactory to those who work in the field. Chronic idiopathic myelofibrosis is preferred by the World Health Organisation, while others prefer the term primary myelofibrosis. None of the terms fully take into account the functional defects—e.g., haemopoietic stem cell disturbance, extramedullary haemopoiesis and the pathological changes seen in the bone marrow (e.g., intense marrow fibrosis).

单词	primary myeloid metaplasia
释义	primary myeloid metaplasia pri·mar·y my·e·loid met·a·pla·si·a myeloid metaplasia occurring as the primary condition, often in association with myelofibrosis. Synonym(s): agnogenic myeloid metaplasia chronic idiopathic myelofibrosis A chronic progressive condition characterised by panmyelosis and variable marrow fibrosis, massive splenomegaly secondary to extramedullary haematopoiesis, and leukoerythroblastic anaemia with dysmorphic red blood cells, circulating normoblasts, immature white blood cells and atypical platelets. Clinical findings Patients are often > age 50, suffer from insidious weight loss, anaemia, and abdominal discomfort due to splenomegaly, often with hepatomegaly; 80% have nonspecific chromosome defects. Diagnosis Bone marrow biopsy. Management No specific therapy; packed RBCs for anaemia; androgens may reduce transfusion requirements, but are poorly tolerated in women; recombinant erythropoietin. Prognosis Survival ± 5 years, often progresses to acute leukaemia. Terminology No name used for this condition has proven consistently satisfactory to those who work in the field. Chronic idiopathic myelofibrosis is preferred by the World Health Organisation, while others prefer the term primary myelofibrosis. None of the terms fully take into account the functional defects—e.g., haemopoietic stem cell disturbance, extramedullary haemopoiesis and the pathological changes seen in the bone marrow (e.g., intense marrow fibrosis).
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