For fibrocystic breast changes, where are the most common sites of cystic masses?

The most common sites for cystic masses in fibrocystic breast changes are indeed in the upper outer quadrant and the axillary tail of both breasts. This distribution is significant due to the anatomy of the breast, as these regions often contain more glandular tissue, where cysts can develop. The presence of hormonal influences, particularly estrogen, contributes to the fluctuation and formation of these cystic structures, commonly found in these areas.

In fibrocystic breast changes, the variation in tissue density and hormonal stimulation leads to the development of multiple cysts, primarily influenced by the menstrual cycle. The upper outer quadrant, along with the axillary tail, tends to show the highest incidence of these changes, aligning with the most common areas of lobular development in the breast.

Other regions mentioned in the other options are typically less affected in these changes. The lower inner quadrant and areolar region, for instance, do not typically demonstrate the same prevalence of cystic formations, which helps to validate the prominence of the upper outer quadrant and axillary tail in this condition.