الفهرس 
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Abstract
It is difficult to achieve good contrast throughout a mammogram in women with extensive mammographically dense tissue, which can obscure some of the subtle signs of breast abnormalities.
Ultrasound is considered the best noninvasive (no needles or injections) imaging modality for dense breast. It gives a clear picture of soft tissues that do not show up well on x-ray images, It produces a picture of the internal structures of the breast and can help to determine if an abnormality is solid (which may be a non-cancerous lump of tissue or a cancerous tumor) or fluid-filled (such as a benign cyst) or both cystic and solid, It also has a great role in characterization of breast lesions which helps in differentiating benign from malignant ones. Ultrasound also provides real-time imaging that making it a good tool for guiding minimally invasive procedures such as needle biopsies and needle aspiration.
In a word, we can safely say that ultrasound is unquestionably a mandatory adjunct to mammography in detection and characterization of breast lesions in mammographically dense breast, which make us came to a conclusion that ultrasound is indispensable in imaging and screening of mammographically dense breast, based on its sensitivity, availability, low cost and non-invasiveness.