發生在腋下之淋巴結結核很少見。本文描述一位33歲女性，最近發現右腋下有摸到腫塊，沒有其他臨床症候，X光胸部攝影與乳房攝影、腹部及乳房超音波檢查均正常。臨床懷疑是潛藏性乳癌轉移至腋下之淋巴結。氟-18去氧葡萄糖正子造影發現廣泛之右腋下及其周圍淋巴結、右鎖骨上下淋巴結有極高之葡萄糖代謝，誤判讀為轉移惡性病灶。經病理組織切片檢查發現是淋巴結結核。此結果提醒我們小心判讀正子造影影像。

Isolated axillary tuberculous lymphadenitis is rare. We present a 33-year-old female who had palpable right axillary masses without remarkable clinical symptom.
Ultrasound examination of breast and abdomen, mammography, and chest radiography were negative. 18F- Fluorodeoxyglucose positron emission tomography (FDG-PET) study was misinterpreted as malignant disease extensively involving right axillary and the surrounding lymph nodes, possibly metastatic occult breast cancer. Tuberculous lymphadenitis was finally proven by tissue biopsy. This potential pitfall should be kept in mind when FDG-PET images are interpreted in areas where the prevalence of granulomatous infection is high.