中文摘要：

目的 评估18F-氟代脱氧葡萄糖（18F-FDG）正电子发射计算机断层显像（PET/CT）对发热待查（FUO）患者的临床应用价值。方法 回顾性分析2009年12月至2011年12月在武汉协和医院PET中心行18F-FDG PET/CT检查的144例FUO患者的临床资料和影像结果。以手术病理、穿刺细胞学检查或者出院诊断并结合12个月以上的随访结果作为最终诊断依据。分析PET/CT图像,并从病变检出率、诊断效率、恶性肿瘤临床分期等方面评价PET/CT对FUO患者的应用价值。结果 144例患者有130例最终得到明确诊断,其中恶性肿瘤41例,良性病变89例,14例病因未明。PET/CT为97.6%（40/41）的恶性肿瘤患者和88.7%（79/89）的良性病变患者检出了异常病灶,其诊断灵敏度、特异度、准确度、阳性预测值、阴性预测值分别为97.6%（40/41）、86.5%（77/89）、90.0%（117/130）、76.9%（40/52）、98.7%（77/78）。PET/CT为46.3%（19/41）的恶性肿瘤患者首次检出了原发灶,并为92.7%（38/41）的患者检出了比传统影像学方法更多的病灶。结论 18F-FDG PET/CT显像对FUO患者病变的检出、良恶性病变的定性诊断及恶性肿瘤的临床分期具有重要参考价值。

英文摘要：

Objective To evaluate the application value of 18F-FDG PET/CT in patients with fever of unknown origin （FUO） to improve the etiological diagnosis accuracy of PET/CT in patients with FUO and provide better service for clinical practice. Methods Clinical data and imaging results of 144 cases of FUO patients diagnosed through 18 F-FDG PET/CT examination in Wuhan union hospital from December 2009 to December 2011 were retrospectively analyzed. The final diagnoses were based on surgical pathology, aspiration cytology, or discharge diagnosis combined with more than 12 months of follow-up results. All the PET/ CT images were analyzed and the clinical application value of PET/CT in FUO patients were evaluated through the diagnose rate, diagnose efficiency and clinical staging of malignant tumor. Results Among the 144 patients, there were 130 cases ultimately had clear diagnosis,which including 41 cases of malignant tumor,89 cases of benign lesions and 14 cases the cause of unknown. PET/ CT detected abnormal lesions for 97.6% （40/41） of patients with malignant lesions and 88.7%（79/89） of patients with benign lesions, and the diagnostic sensitivity, specificity, accuracy, positive predictive value, and negative predictive value were.. 97.6% （40/ 41）,86.5%（77/89）,90%（117/130）,76.9% （40/52） and 98.7%（77/78）. PET/CT detected the primary lesions for the first time in 46.3% （19/41） patients with malignant tumor,and detected more lesions than the traditional imaging methods in 92.7% （38/ 41） of these patients. Conclusion 18 F-FDG PET/CT imaging can provided important reference value for the detection of primary lesions,the qualitative diagnosis of benign and malignant lesions and clinical staging of malignant lesions.