在氟-18葡萄糖正子造影篩檢過程中揭露甲狀腺偶發瘤的個案正逐年增加。本文報告一乳腺癌監測 之病例，病人於氟-18葡萄糖正子造影偵測到甲狀腺偶見瘤倂發肺轉移，後續接受甲狀腺和肺葉切除手 術，術後合倂碘-131放射藥物治療。
一般來說，使用正子造影檢測惡性腫瘤，或用碘-131掃描監測分化型甲狀腺癌，被認爲是高的敏感 性。有趣的是，本例病人在FDG正子造影和碘-131掃描中，甲狀腺癌和肺轉移並沒有顯示活躍攝取。本 文將討論臨床診斷上遭遇的挑戰，同時回顧近年來甲狀腺偶見瘤的相關文獻，並進行討論。
總結說來，無論氟-18葡萄糖標準攝取値之多寡，以及甲狀腺偶見瘤的大小，正子造影一旦發現甲 狀腺偶見瘤有氟-18葡萄糖攝取陽性，以及臨床理學檢查呈局部性或單側性病變，將有更進一步檢查之必要。

The incidentalomas of the thyroid are increasingly detected in patients undergoing FDG-PET checkup. The authors report a fortuitous discovery of papillary thyroid cancer with pulmonary metastasis during the surveillance of breast cancer by FDG-PET scan. Generally，the sensitivity of FDG-PET/CT in detecting malignancies and that of post-therapy 1-131 scan in monitoring differentiated thyroid cancers is considered high. Interestingly, the thyroid cancer and pulmonary metastases did not show avidity of F-18 FDG nor 1-131 uptake in this case. The diagnostic challenges encountered were discussed. The presence of certain risk factors such as physical findings and focal or unilateral FDG uptake on PET warrants further examination regardless of the SUV or of the size of the incidentaloma.