I'm not a pathologist; I'm a scientist, but I know a lot of foreign-trained pathologists and have been married to one through match, residency, and now fellowship, so I have some knowledge of the process.
In other specialties, it's not unheard of for physicians from abroad to do a US fellowship as the first step towards practice here. I think that route is either uncommon or non-existent in pathology though. I know one foreign physician who entered US pathology residency after doing a "research fellowship" at the intersection of their original specialty and pathology, but I think that "research fellowship" was basically a postdoc.
OP, in my opinion you should go to a forum that is specific to foreign physicians who are preparing for the USMLE. There are two or three big ones online. I say that because everything from the usual timing of Step 3 to immigration concerns is significantly different for foreign physicians. Since this particular forum is populated mainly by AMG's and Caribbean grads, it's likely to be more relevant to you after you enter US training, at which point the issues become more similar for AMGs vs foreign physicians.
Also, you need an understanding of how US medical training is structured. Before going further, I would advise you to become very familiar with the overall path from where you are to US practice--and also to decide whether it's right for you. It's a long, difficult, and expensive road--a couple of years to match, another 3-4 of residency, probably followed by another 1-2 of fellowship. I myself did a PhD, postdoc, etc. so I'm not unfamiliar with long training, repeated moves, and low pay...but still, blah...it's a lot to go through if the alternative is being a practicing physician in your own country. Just my $0.02, speaking as somebody who hasn't been through it myself but who has seen it up close and personal.
