急性化膿性甲狀腺炎是一種少見的疾病，臨床表徵為甲狀腺腫大、皮膚表面有發紅、壓痛、發燒…等。我們報告一位五十二歲的女性，因左側甲狀腺腫大且疼痛、發燒住院治療。甲狀腺超音波發現左側甲狀腺有2.28×2.1公分大腫塊、用細針抽取內容物發現許多白血球。在急性化膿性甲狀腺炎之診斷下，給予抗生素治療及切開腫塊後改善病患症狀。患者痊癒三個月後接受barium swallow study的檢查，未發現瘻管。病患參年前此症狀，經過藥物治療及手術引流膿瘍後便全癒。此病患為中年女性無糖尿病或免疫機能不足病史，但兩年內反覆發生化膿性甲狀腺炎並未發現pyriform sinus瘻管是個少見案例。

Acute suppurative thyroiditis is a rare disorder that causes severe pain, tenderness, redness and fluctuation in the region of the thyroid gland. A 52-year-old healthy woman had acute onsets of left neck painful swelling on two occasions, three years ago and one year ago, respectively. A sonography examination revealed a hypoechogenic area on the left lobe of thyroid, about 2.28×2.1cm in size; a fine-needle aspiration biopsy showed neutrophil infiltration. Appropriate antibiotic treatment and incision and drainage of mass relieved the symptoms of the infection. The patient had no history of diabetes mellitus and no sign of pyriform sinus fistula on barium swallow study; it is unusual to develop recurrent suppurative thyroiditis in such a patient.