The partitioning of the breast is commonly done clinically with reference to the hands of a clock, the numbers are divided into 12 equal parts, with the nipple as the center, and each different o’clock position represents a different breast area in a radial pattern. For example, 12 o’clock is the upper part of the nipple, 9 o’clock is the outer part of the breast, that is, the left side of the left breast and the right side of the right breast. Thus 10 o’clock would be the middle of 9 and 12 o’clock, i.e. the left breast is the upper left and the right breast the upper right area. There is another one that draws a cross with the nipple as the center, and the breast area is divided into 4 equal parts, inner upper quadrant, outer upper quadrant, inner lower quadrant, inner lower quadrant, etc. Therefore, the right breast at 10 o’clock is the upper outer quadrant or the upper outer quadrant, which is a common site for breast cancer. If the site suggests abnormalities such as nodules and lumps, a biopsy pathology should be performed for diagnosis.