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