Tuberous breasts: structural or hormonal?

Thank you for your question. Tuberous breasts are a structural issue deformity. This can be corrected with different sized implants. I would advise you to
schedule a consultation with a board certified plastic surgeon for a detailed
examination to discuss all possible treatment options and what your
expectations are.
 

Generally speaking, Tuberous/constricted breasts are a structural (developmental) breast condition.   Of course, breasts (whether tuberous/constricted or not) can be effected by their hormonal environment.

Generally, some of the characteristics seen with tuberous breasts include a very narrow base, short distance from areola to inframammary fold, tight (constricted) lower pole of the breasts, relatively wide space between the breasts, "puffy" areola and some degree of ptosis (drooping).
 
  Generally,  correction of tuberous breast anomalies involves breast augmentation with areola reduction / mastopexy procedure. The distance from the inframammary fold is increased (to create a more rounded out appearance). Proper implant positioning improves the distance (cleavage) between the breasts. The areola reduction helps to treat the pointed and "puffy" appearance of the areola.

My best advice: select your plastic surgeon carefully. Make sure that he/she has significant experience achieving the types of outcomes you will be pleased with. Then, communicate your goals carefully, as well. Best to use visual aids such as goal photographs, not a discussion of cup sizes, during the communication process. Working together you will come up with a good plan to achieve your goals.  Best wishes.