I dunno, I don't think ridiculous cosmetic surgery (that can be reversed) should be grounds to question someone's medical ethics or to pull their license. Who's to judge what's an ethical procedure and what isn't? Any surgery has its risks, therefor why would *any* cosmetic surgery be morally justifiable? Who is getting a third boob any different than getting implants to have bigger ones? Or even a nose job, provided your given-nose isn't causing any breathing problems?
There's all kinds of crazy cosmetic surgeries people get done, elfin/Vulcan ears, textured skin to emulate reptilian skin or other types of skin. Getting beads or other types of implants to creat bumps, ridges and such on the body. There's a shit-load of things people get done to surgically alter their body.
So I don't see how a third boob is anymore different or radical than, say, getting cosmetic surgery on your labia or penis. (provided it's purely cosmetic and the given genitals are functional. If the defect impacts a healthy sex-life/sexual function then there's a need for surgery.)
So I don't think the doctor's ethics should be called into question or have his license questioned/revoked.
The surgery isn't "that" radical considering other kinds of surgery and I suspect it's fully reversible as well, unlike the only kind of cosmetic surgery I can think of that calls for a LOT of consideration and counseling on the intended patient; gender-reassignment surgery, considering that surgery is irreversible.
The woman -whatever her motivations for the surgery may actually be- is out of her mind and stupid. But the doctor performing the surgery hardly "disfigured her" beyond repair and as far as we know performed the surgery competently and to the woman's satisfaction. So I think on some medical ethic ground he's in the clear.
(As far as I know, a person isn't required to be mentally sound to get cosmetic surgery. Again, unless it's "irreversible" as would be the case in gender-reassignment.)