PET评价骨转移瘤

肿瘤骨转移会产生顽固性骨痛和脊髓受压等严重并发症,并对分期、治疗和判断预后产生深远的影响,因而探测骨转移是制定治疗计划的重要部分。骨转移瘤发现频率因原发肿瘤的类型和所用检查手段不同而不同,虽然目前核素骨扫描是探测骨转移瘤最常用的手段,但其对骨转移瘤的诊断效能仍有一定限度。与99mTc-亚甲基二膦酸盐(99mTc-MDP)骨显像相比,18F-氟化钠(18F-NaF)和18F-氟代脱氧葡萄糖(18F-FDG) PET是分别从骨转移瘤产生的成骨反应和骨转移瘤本身的代谢活性角度进行评价的两种正电子示踪剂,结合PET的高度空间分辨率,特别是最近迅速应用于临床的PET-CT技术,使得正电子体层显像在全身骨骼恶性疾病评价上的准确性进一步提高。

PET in the evaluation of bone metastases

The skeleton is one of the most common metastatic sites in patients with maligancy skeletal metastases are clinically significant because of associated symptoms, complications such as pathological fracture and their profound significance for staging, treatment and prognosis. Detection of bone metastases is, thus, an important part of treatment planning. The frequency with which metastases are detected varies considerably with the type of primary tumor and with the methodology utilized for detection. Bone scan is the most common modality in detection bone metastases. But its accuracy in early stage of bone metastases is limited. 18F-NaF and 18F-FDG are two different positron tracers, which can detect bone metastases by osteoblastic reaction of bone to the presence of tumors and directly tumor imaging, separately. Combination with the high resolution of PET, especialy the PE-CT which also provide a better anatomic localization, the accuracy of detection of bone metastases was improved significantly.