99Tcm-亚甲基二膦酸盐全身骨显像评价原发性肺癌骨转移的特征

目的 探讨原发性肺癌骨转移病灶的影像学特征.方法 对258例病理确诊的肺癌患者行99Tcm-亚甲基二膦酸盐(99Tcm-MDP)全身骨显像,分析各部位骨骼的骨转移率、病灶构成和病灶的形态特征等.结果 全组258例肺癌患者中,存在骨转移142例,骨转移率为55.0%,其中中轴骨的骨转移率为49.6%,四肢骨为36.0%;中轴躯干骨为48.4%,四肢带骨为31.4%;肋骨、胸椎、髂骨和腰椎骨的转移率较高,均>20%.共检出骨转移病灶1252个,其中位于身体左侧406个,居中387个,右侧459个,左右两侧病灶数的差异无统计学意义(χ2=3.3,P=0.072);浓聚病灶1224个(97.8%),混合性病灶26个(2.1%),稀疏病灶2个(0.2%).骨转移病灶按形态归类后共1133个,其中点状病灶810个(71.5%),团状病灶159个(14.0%),条状病灶108个(9.5%),片状病灶56个(4.9%).1-3个病灶的累积骨转移率为28.7%,随着病灶数的增加,骨转移率逐渐降低.早期骨转移病灶分布无明确规律,晚期骨转移病灶呈随机性广泛分布.结论 肺癌易发生骨转移,骨转移早期病例临床最为常见;骨转移好发于中轴躯干骨和四肢带骨,以放射性浓聚病灶为主,以点状为早期病灶形态;早期骨转移病灶分布无明确规律,晚期骨转移病灶呈随机性广泛分布,并且常呈多发性多形态病灶并存的特征.

99mTc-MDP wholebody bone imaging in evaluation of the characteristics of bone metastasis of primary lung cancer

Objective To explore the image characteristics of bone metastasis of primary lung carcinoma. Methods Whole-body bone imaging (99Tcm-MDP) was performed in 258 patients with papthologically proven lung carcinoma. The rate of bone metastasis, distribution of the metastatic lesions and their characteristics were analyzed. Results Among the 258 cases, 142 patients developed bone metastasis. The overall rate of bone metastasis was 55.0%. The metastases located in axial skeleton were 49.6% , appendicular skeleton 36.0% , trunk bones of the axial skeleton 48.4% , and appendicular girdle skeleton 31.4%. Ribs, thoracic vertebrae, ilium and lumbar vertebrae had a higher rate of bone metastasis,higher than 20% , respectively. 1252 lesions were detected including 406 at the left side of the body, 387 in the axial skeleton and 459 at the right side of the body. There was no significant difference in terms of number of lesions between left side and right side (χ2 =3.3,P=0.072). 1224 bone metastatic foci (97.8%)were presented as strong radioactive, 26 (2.1%) mixed lesion, and 2 (0.2%) low radioactive. According to the shape of the lesions, there were 810 punctate lesions (71.5%) , 159 (14.0%) lump form, 108(9.5%) strip form and 56 (4.9%) lamellar form. The accumulative bone metastasis rate was 28.7% for the patients with one to three lesions. The metastasis rate decreased gradually with the increasing number of metastatic lesions. Conclusion Bone metastasis is very common in patients with lung cancer. Most bone metastases are characterized by strong radioactive and earlier punctate form, often occurs in the trunk bones of axial skeleton or appendicular girdles. The distribution of earlier metastases has not obvious regularity,and advanced bone metastases are often concurrent, multiple and multiform, widely and randomly distributed in the body.