腮裂囊腫為側頸部最常見之發育性囊腫，最常發生的位置為位於胸鎖乳突肌之前緣、頸動脈間隙側方以及 下頜唾液線之後方。腮裂囊腫多為無症狀表現，但感染後腫脹疼痛症狀較為明顯。好發年齡為二十歲左右。抗 生素合併手術切除為目前最廣為接受的治療方式。我們在此提出一完整性的病例報告，記錄患者之發病過程以 及相關手術提供臨床參考。(J. Family Dent. 9(4): 43-48, 2015)

Branchial cleft cysts are the most frequent both congenital abnormalities and developmental cysts on the lateral side of neck. Here we present a girl who had a swelling mass at the level IIA region and would like to share our treatment experiences. Clinically, the lesion presented with smooth margins, well-defined limits, tense-elastic, non-tender upon palpation, moving on the plane up and down. The fine needle biopsy and CT confirmed the cystic nature of the lesion (may be lymphangioma). After its removal, the histological examination disclosed the diagnosis of an infected branchial cleft cyst. (J. Family Dent. 9(4): 43-48, 2015)