dr. gotz's sofa braces for an uncomfortable ride home. many of his patients become addicted to injections. >> so doesn't this worry you? >> but for a lot of people in the u.s. watching this they would consider you to be doing exactly that. to be doing this basically for money, this procedure that is dangerous and illegal. what would you say? >> reporter: we went to see how sofia was doing. she came back from the doctor three days ago. so ever since she got the injections she has to lay down like this all day, for three days now. so one more week of laying down like this, rest, avoiding walking, definitely no sitting down. but sofia says she's not finished. and before we departed caracas she told us she plans to do it again, when she can. and despite the risk of pain, injury, even death, women like sofia are willing to pay the price chasing what will become for some of them a fatal obsession. for "nightline" i'm mariana van zeller. >> our thanks to mariana. fascinating story. and by the way, if you can't get enough of "nightline," we've go

dr. gotz's for the surgery, it's actually not her first time. she was here four years ago when she was 16 years old. she's back because she feels it's not big enough. >> why are you here today?