How is DCIS Diagnosed?
DCIS is usually detected on a screening mammogram. An additional mammogram, called a magnification mammogram, will provide a better look at the area of the breast that is in question. A biopsy, however, is the only way to diagnose a cancer. This is done by taking a sample of the suspicious tissue and having a cytopathologist study it under a special microscope. There are different kinds of DCIS and only a pathologist can determine which kind of DCIS it is. Ultrasound may also be used, although DCIS does not usually present as a mass or distend the breast duct. For some DCIS cases, however, ultrasound is useful for defining size, shape, and extent. Ultrasound may be helpful, but it is not a substitute for a mammogram. …
