慢性中性粒细胞白血病（ＣＮＬ）与多发性骨髓瘤（ＭＭ）均为血液系统恶性肿瘤，后者发病率３．４／１０万，而前者颇为罕见［１］。我院５年前确诊迭患１例［２］并追踪观察至今，现报道如下。１病例介绍患者。男，６６岁，１９９２年４月无明显诱因出现多部位关节疼痛，不伴 Chronic neutrophilic leukemia (CNL) and multiple myeloma (MM) are both hematological malignancies. The latter has a prevalence of 3.4/100,000, and the former is rather rare [1]. In our hospital, diagnosed one patient with multiple cases 5 years ago [2] and follow-up observations are reported as follows. 1 Case Introduction Patient. Male, 66 years old, April 1992 No apparent cause of multiple joint pain, not associated