Final answer:
The axillary tail is the area most often missed in breast self-exams, which are crucial for early detection of breast cancer.
Step-by-step explanation:
When teaching women how to conduct a monthly breast self-exam, it is important to emphasize that the axillary tail of the breast is the area most often missed during self-exams. This area extends into the armpit and can be a site where changes related to breast cancer may occur.
Women should perform a monthly breast self-exam to detect any lumps or subtle changes in the breasts. Starting this practice early, even in the teen years, is recommended because it helps women become familiar with what is normal for their bodies. Moreover, detecting breast cancer early can lead to a better outcome, as treatment is more successful during the early stages of the disease.