長倉 穂積¹, 川内 章裕², 伴 良雄¹, 森田 嘉生¹, 海原 正宏¹, 原 秀雄¹, 福成 信博², 九島 健二¹, 谷山 松雄¹, 神谷 憲太郎², 伊藤 国彦³, 片桐 敬¹

Hozumi NAGAKURA¹, Akihiro KAWAUCHI², Yoshio BAN¹, Yoshio MORITA¹, Masahiro KAIHARA¹, Hideo HARA¹, Nobuhiro FUKUNARI², Kenji KUSHIMA¹, Matsuo TANIYAMA¹, Kentarou KAMIYA², Kunihiko ITOH³, Takashi KATAGIRI¹

¹昭和大学第三内科, ²昭和大学外科, ³伊藤病院

¹The Third Department of Internal Medicine Showa University School of Medicine, ²The Department of Surgery Showa University School of Medicine, ³Itoh Hospital

キーワード : Oxyphilic cell tumors, Ultrasonography, Thyroid neoplasm, Tissue characterization

Oxyphilic cell tumors in the thyroid, a component of follicular tumors, are of varying malignancy, and it is hard to distinguish malignant from benign tumors before operation. Therefore diagnosis of oxyphilic cell tumors before operating is helpful. However this diagnosis is difficult except through cytology. We retrospectively examined ultrasonic findings in 15 patients with oxyphilic cell adenoma and 8 patients with oxyphilic cell carcinoma who were diagnosed histologically. Ultrasonic examination was performed with high resolution equipment using a 7.5 MHz mechanical arch scanner.
The characteristic findings of oxyphilic cell tumors on ultrasonography were hypoecho of the internal echo and a marginal hypoechoic tendency. The rate of occurrence of these findings in oxyphilic cell tumors was significantly higher than in other follicular adenoma. But we couldn't distinguish oxyphilic cell adenoma from carcinoma, because their shapes were uniform, and calcification and invasive findings were rarely found in carcinoma.
We suggest that ultrasonic examination is only helpful to distinguish oxyphilic cell tumors from other follicular adenoma.