The document discusses the anatomy seen on ultrasound of the breast. It notes that normal breasts vary in composition and contain fine ligaments dividing the breast into lobules. Deep structures like the chest wall and ribs appear echo-poor but should be assessed. Normal glandular tissue has intermediate echogenicity and may contain hypoechoic lymph nodes, while lactating women have hypertrophied glandular components. Cysts are anechoic structures that can be simple or complex, with complex cysts having thick walls, septa, or mural nodules.