内頸静脈奇形の1症例

Anomaly of Internal Jugular Vein:A Case Report

　緒言

　内頸静脈の奇形には，内頸静脈高位，内頸静脈拡張症，内頸静脈瘤などがあり，臨床的にしばしば問題となる。われわれは，口腔底平扁上皮癌頸部転移症例の手術の際，偶然みられた珍しい内頸静脈奇形の1例を経験したので，若干の文献的考察を加え報告する。

Anomaly of the internal jugular vein was found incidentally during left conservative neck dissection in a 56-year-old male patient with neck lymph node metastasis from cancer of the oral cavity. He received laser operation to the primary lesion which recurred in his left neck 7 months later. A conserva-tive neck dissection was performed, and anomaly of the internal jugular vein was found locating at the laryngeal level. The internal jugular vein bifurcated into two branches and then joined together approxi-mately 2 cm above the bifurcation.

There have been several reports of the versatile anomalies of the internal jugular vein, however, we could not find a similar anomaly case in the litera-tures.