Breast Augmentation Even with Fibrocystic Breasts?

Hi there-
I think that if you are a few years away from children that this need not be a deterrent to your pursuit of breast enhancement surgery.
The fibrocystic changes in your breasts may or may not be more of a concern. It sounds like surveillance of your breasts is already a bit difficult, and thus the need for ultrasounds rather than mammograms (or in addition to them). Other possible variables to consider are whether or not you have a family history of breast cancer, who was affected, and at what age. It would also be important to discuss this with your gynecologist and/or the radiologist who does your ultrasounds to see what their level of concern would be, as implants of all types and in all locations will make certain exams more difficult. This is more significant with implants on top of the chest muscle (so I definitely recommend placing them under your muscle given your circumstances).
If your radiologist and gynecologist feel adequate surveillance can be achieved with implants under your muscle (this should be likely) and that your risk is low (depends on family history), I would think you are a reasonable candidate.
If you have a strong family history of breast cancer, and your other physicians believe that placing implants would create an unacceptable risk of missing a significant finding within your breasts, then it may not be a good option for you (this would be very rare).
Find a Board Certified Plastic Surgeon with a lot of experience in breast surgery, a good reputation, and a comfortable personality for you (it is a relationship, after all), and discuss it with them.

Many patients with fibrocystic disease undergo breast augmentation. If you are concerned, then I would suggest seeing a general breast surgeon and seek out his/her opinion.  A baseline mammogram may not be a bad idea first.