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1·Objective to evaluate bone marrow scintigraphy in diagnosis, differential diagnosis, judging prognosis in patients with refractory anemia (ra) and Chronic aplastic anemia (CAA).

目的评价骨髓核素显像对难治性贫血(RA)和慢性再生障碍性贫血(CAA)的诊断、鉴别及疗效预测的作用。

2·Chronic aplastic anemia (CAA), with complex causings of disease and multiple pathogenic mechanism, is a refractory blood disease.

慢性再生障碍性贫血（CAA）是临床难治的血液疾病，其致病原因复杂，发病机制多样。