藤本 武利^{1, 2}, 中沢 英樹^{1, 2}, 北村 隆信¹, 小林 和生¹, 秋山 洋^{1, 2}

Taketoshi FUJIMOTO^{1, 2}, Hideki NAKAZAWA^{1, 2}, Takanobu KITAMURA¹, Kazuo KOBAYASHI¹, Hiroshi AKIYAMA^{1, 2}

¹虎の門病院外科, ²沖中記念成人病研究所

¹Department of Surgery, Toranomon Hospital, ²Okinaka Memorial Institute for Medical Research

キーワード : Halo, Character of halo, Irregular halo, Histological capsular invasion

　Ultrasonographic patterns of thyroid nodules were correlated with pathologic findings. Thyroid nodules were examined with a real-time ultrasound scanner (HITACHI EUB-40,5 MHz convex type probe) equipped with a jelly pack produced on a centrifuge.
　On thyroid ultrasonography, the halo sign appeared in cases of follicular-pattern-dominant tumor. Histological capsular invasion appeared in seven of the ten cases presenting irregular halo. In diagnosing histological capsular invasion, sensitivity was 88%, specificity was 67%, and accuracy was 76%. Chai-square evaluation indicated that this finding was statistically significant (p<0.05).
　Thyroid nodules with irregular halo signs are carcinomas with capsular invasion. The authors are now diagnosing thyroid nodules with irregular halo signs as follicular-pattern-dominant carcinomas, though more ultrasonographic case studies will be necessary before the diagnoses of histological type.