I was recently looking for information on breast implants here in Brazil... and I ahven't found anything that says what's legal or not... I've found some sites (from plastic surgeons and magazines/newspapers) that says that a girl as old as 16 may get breast implants here... the here age is actually defined by body development (something like 5 or 6 years after first **110**)...
I never heard of any brazilian woman getting very large breast implants... There is this model, Cristina Mortágua, who recently got 365ccs (or something like that) and it was a big thing, since she is supposedly the woman with the largest breast implants in Brazil... it was a shock to a lot of people and something not very common to see...
Anyways... to go back in topic, I don't think there's a ban to polypropylene string implants here in Brazil (or in Rio de Janeiro, for that matter), but I'm not sure if there are any doctors here who works with those kinds of implants either...
Even tho we are really big in plastic surgery in general (Brazil being considered one of the best in PS), silicone breast implants only started to be common some 4-5 years ago... If anyone has 350cc, it's considered a lot... because of that, very big breast implants are not common... If you could find a doctor who could develop polypropylene technology here, then you'd be very lucky!
But if you'd like to come to Brazil, tourism alone is worth the trip!
PS: A quick translation to the image I posted: "Cristina Mortágua shows the largest breasts in Brazil at
Sexy Magazine"