[Ultrasonographic diagnosis of breast cancer with intraductal spreading of cancer cells].

The estimation of intraductal lesions of the breast has become possible due to the careful examination of ultrasonic ductal images. The diagnostic accuracy ratio of the lesions was 94.4% by using our classification of dilated ducts by ultrasonography. The characteristics of the findings of intraductal spreading of breast cancer are that the wall of the duct is thick and uneven because of the proliferation of cancer cells, the tumor usually has a broad base all along the walls, and, when the duct is filed with cancer cells, the circumference becomes so varied that it appears outwardly irregular in size and shape. Microcalcifications and irregular nodules along the ductal network are also sometimes apparent. The diagnosis of the area of intraductal spreading of cancer cells could come about from examining the continuous spreading throughout the network by ultrasonography. We have succeedingly obtained successful results from using this method for the past eight years. The diagnostic accuracy ratio to determine the indication for breast conservative surgery and the extent of the breast excision was 94.2% in cases in which the tumor size was less than 3.0cm and the distance from the nipple was over 3.1cm, and in nonpalpable cases. In breast conservative surgery, the firm establishment of a proper diagnostic method is needed to prevent any cancerous tissue from being left. At this point in the evolution of the diagnostic method for intraductal spreading, ultrasonography is one of the key elements to achieve this goal. From now on, ultrasonography will be in the spotlight and take a more leading role in the continuing development of this diagnostic procedure.