小西 豊¹, 小縣 正明¹, 黒木 輝夫¹, 栃尾 人司², 藤本 敏明¹, 森本 義人¹, 相川 貴子¹, 尾上 一美¹, 大谷 雅美¹, 宇井 一世¹

Yutaka KONISHI¹, Masaaki OGATA¹, Teruo KUROKI¹, Hitoshi TOCHIO², Toshiaki FUJIMOTO¹, Yoshito MORIMOTO¹, Takako AIKAWA¹, Kazumi ONOE¹, Masami OTANI¹, Kazuyo Ui¹

¹神戸市立中央市民病院外科, ²神戸市立中央市民病院超音波検査室

¹Department of Surgery, Kobe Municipal Central Hospital, ²Ultrasonic Laboratory, Kobe Municipal Central Hospital

キーワード : T1 breast cancer, Mastopathy, Ultrasonography

One of the reasons for unsatisfactory accuracy rate of the ultrasonography of the tumors sized less than 20 mm in diameter is the difficulty in differentiating the tumor-forming mastopathy from T1 breast cancer. We paid a special attension to the ultrasonic feature of the anterior borderline of the mammary gland to resolve this problem for the differentiation.
The anterior borderline was demonstrated to be smooth in mastopay, whereas in cancer it was interrupted or rough in 55 out of 58 lesions. This can be coincident to histological findings; in mastopathy the lesion always located within the mammary gland, on the other hand in 55 out of 58 cancer lesions infiltrated through fatty tissue.
Our result of this series was that the sensitivity was 94.8% (55/58) and the specificity was 96.6% (86/89) respectively.
In conclusion, ultrasonic feature of the anterior borderline of the mammary gland is very useful in the differential diagnosis between the tumor-forming mastopathy and T1 breast cancer.