Answer:
The ptotic breast is characterized by the inferior-lateral descent of both the glandular breast and NAC. The NAC assumes a dependent position on the lower pole convexity on the breast rather than the youthful position and the point of maximal projection higher on the breast mound.
Classification by Regnault:
-First degree (minor) ptosis: the NAC is at or slightly above the inframammary fold, and above the lower hemispheric conxexity of the breast.
-Second degree (moderate): NAC is below the IMF, but NAC is still located on the anterior projection of the breast mound.
-Third degree (major): the NAC is below the IMF and on the dependent position of inferior convexity of the breast mound.
-In severe ptosis the nipple points downward.