OK. r.e. the last post above...
In your situation I would definitely go for a preliminary surgery year. Then if you do well you might get a shot at getting in to ENT from there. Also, if you do the prelim surgery year, you won't have "used up" any more than 1 year of the allowed Medicare funding. Try to do the prelim year some place that they have an ENT residency, and try really hard to impress people while you are there. I hope you did well on USMLE, because ENT is fairly competitive, even for a US med school grad. You better have a backup plan (i.e. switching to general surgery, or even another specialty) ...that applies to even US grads, unless they are top of their classes. If you can't get in ENT after one surgical prelim year, then maybe do a year of research working for an ENT doc, or in his lab.
If you did something like started out in family med or internal med, then for one thing you wouldn't get ANY credit toward a surgical residency, if you later transferred. That would suck b/c you would have to repeat your intern year, even if you ever did manage to get an ENT surgery spot. The 2nd problem is if you start in some specialty like internal med or family practice, then the Medicare people in the government, who fund residency programs, will attach a limit of 3 years (the length of that residency) to the number of years of residency that you can have funded. So if you switched to any type of surgical residency, including ENT, after 1 year in internal med, then you'd only get 2 years of surgery residency paid for. A lot of hospitals won't want to hire you because they can get some other intern from a med school, for whom they'd get 5 years of money/salary paid for by Medicare. It's a weird rule, but apparently it exists.