This is a close-up photograph of breast tissue. There are areas of white fibrous tissue toward the top. Below, bright yellow fatty tissue is the dominant component. In the upper half of the image, cystic spaces are present. These contain usually watery fluid. The bluish areas are the so called "blue dome cysts," and under the microscope show apocrine metaplasia. These later areas have features of sweat glands, hence the name "apocrine."