正电子发射断层显像-计算机断层显像在鼻咽癌远处转移诊断中的应用价值

 【摘要】　目的　探讨正电子发射断层显像-计算机断层显像（PET-CT）在鼻咽癌远处转移诊断和M分期中的价值。方法　257例初治鼻咽癌患者于治疗前行胸部X线摄片、腹部B型超声检查、骨发射单光子计算机断层扫描（ECT）等常规检查和PET-CT扫描。依据病理活检和随访结果比较PET-CT和常规检查在远处转移诊断和M分期中的作用。结果　39例（15.2 %）鼻咽癌存在远处转移，其中PET-CT检出34例，而常规检查仅检出22例。PET-CT假阳性率为12.8 %（5／39）。若按转移灶分布部位分析，PET-CT能提高纵隔转移检出率（χ2＝4.063，P＝0.041）和骨转移的检出率（χ2＝5.939，P＝0.015）。与常规检查相比，PET-CT改变了19例（7.4 %）患者的M分期，判断正确14例，判断错误5例。结论　PET-CT判断鼻咽癌远处转移和M分期较常规检查准确。

The role of PET-CT in diagnosing distant metastasis of nasopharyngeal carcinoma

Objective To explore the clinical significance of PET-CT in evaluating distant metastasis and M staging of nasopharyngeal carcinoma(NPC). Methods 257 NPC patients with no prior treatment were investigated with PET-CT and conventional imaging (chest X-ray, abdominal ultrasound, and bone scan). The findings of PET-CT in diagnosing distant metastasis and M staging were compared with those of conventional imaging according to the results of biopsy and follow-up. Results PET-CT disclosed 34 of 39 patients with distant malignancy compared with 22 patients disclosed by conventional imaging. The false positive rate of PET-CT was 12.8 %. On region-based analyses, PET-CT was more effective than bone scan and chest X-ray for detecting mediastinum metastasis (x2=4.063, P =0.041) and bone metastasis (x2=5.939, P=0.015), respectively. Compared with conventional imaging, PET-CT had an impact on the M staging of 19 patients (7.4 %), of which 15 patients were truly staged and 4 patients incorrectly staged. Conclusion PET-CT is superior to MRI in evaluating distant metastasis and M staging of NPC.