18氟-2-脱氧-D-葡萄糖PET/CT全身显像对不明原发灶肿瘤处理决策的影响

目的探讨“氟-2-脱氧-D．葡萄糖（^18F-FDG）PET／CT全身显像在不明原发灶肿瘤处理中的价值。方法回顾性分析34例已行^18F—FDGPET／CT全身显像而常规检查未能发现肿瘤原发灶患者。PET／CT图像分析采用视觉及半定量分析方法。组织病理、细胞学结果和／或临床随访对PET／CT结果进行评价。结果34例患者中,FDGPET／CT显像发现可疑肿瘤原发灶20例,其中位于肺部9例,结肠3例,直肠2例,胰腺、右杓会厌壁、食管及乳腺各1例,卵巢2例。20例可疑原发灶中,17例经组织病理学、细胞学和／或临床随访结果证实为真阳性,其中位于肺部8例,结肠2例,直肠、胰腺、右杓会厌壁、食管及乳腺各1例,卵巢2例。另3例假阳性分别位于肺、结肠及直肠各1例。^18F-FDGPET／CT全身显像对不明肿瘤原发灶检出率为50．O％（17／34）,假阳性率为8．8％（3／34）。50．0％（17／34）的患者^18F—FDGPET／CT显像后因发现原发灶和／或新的转移灶而改变临床治疗方案。结论^18F-FDGPET／CT显像对不明肿瘤原发灶病例的处理决策有明显的影响,对于常规检查无法确定肿瘤原发灶的病例,^18F-FDGPET／CT全身显像有重要意义。

The role of whole body 2-[fluorine-18]-fluoro-2-deoxy-D-glucose positron emission tomography/computed tomography in the management of unknown primary tumors

OBJECTIVE: To assess the role of 2-[fluorine-18]-fluoro-2-deoxy-D-glucose ((18)F-FDG) positron emission tomography/computed tomography (PET/CT) in the management of unknown primary primary (CUP) with metastatic loci. METHODS: Thirty-four patients of CUP with metastatic loci who had undergone unsuccessful conventional diagnostic work-up underwent (18)F-FDG PET/CT. The images thus obtained were analyzed with visual and semi-quantitative methods. Histopathology, cytology, and/or follow-up were used to evaluate the PET/CT results. RESULTS: In 20 of the 34 patients (18)F-FDG PET/CT showed focal tracer accumulations corresponding to potential primary tumor sites located in the lung (n = 9), colon (n = 3), rectum (n = 2), pancreas (n = 1), right aryepiglottic wall (n = 1), esophagus (n = 1), breast (n = 1), and ovary (n = 2). The detection rate of primary tumor by (18)F-FDG PET/CT was 50.0% (17/34), the primary tumors were identified in the lung (n = 8), colon (n = 2), rectum (n = 1), pancreas (n = 1), right aryepiglottic wall (n = 1), esophagus (n = 1), ovary (n = 2), and breast (n = 1). The false positive rate was 8.8% (3/34) with the diagnosis of primary tumor in the lung (n = 1), colon (n = 1), and rectum (n = 1) to be identified as false. In 14 of the 34 patients, (18)F-FDG PET/CT did not reveal lesions suspected to be the primary tumor sites in 13 patients, and it was impossible to identify one lesion as the most likely primary tumor in one patient due to the presence of multiple hot spots in several organs. The (18)F-FDG PET/CT findings affected the medical management in 17 of the 34 (50.0%) patients due to the finding of primary sites and/or additional metastases. CONCLUSION: (18)F-FDG PET/CT has relevant impact on the therapeutic management of patients with unknown primary tumor. It is recommended that (18)F-FDG PET/CT be performed in the patient with unknown primary tumor after unsuccessful conventional diagnostic workup.