I'm not sure that there exists a large demand for pathologists in terms of international aid, or working in developing countries (i know this may not be what you are talking about, but this is what i can comment on at the moment). i.e. Doctors Without Borders (MSF) are not dying for pathologists, to my knowledge. however, that does not mean that pathologists cannot help tremendously. If you look at the disparities in healthcare worldwide, perhaps the biggest gap that exists when comparing developing-to-developed countries is the range and quality of diagnostic services. they have extremely limited technological resources, barely mediocre. as a pathologist, i hope to help resource-limited healthcare systems improvise and find cheap, practical ways to arrive at diagnoses (and the flow of information goes both ways, too), with the hope that treatments are available.
I will be doing an inventory of diagnostic capabilities/services throughout Uganda and Kenya next year, and i think i'll find plenty of gaps that can readily be filled with minimal funding. Or at least provide insight into where they can get the most bang for their buck. but, i have to collect the data first. one way or the other, the fact is: the knowledge of a pathologist is just as unique and valuable as that of an anesthesiologist, cardiologist, FP, etc etc. if healthcare is to improve worldwide, it will absolutely require the input of well-trained pathologists. Where to start is the question. My philosophy is that if you don't know what people are using to reach their diagnoses, you'll never know how they are failing, or whether they are failing at all.
anyway, i'm told by some attendings that you can work all over the place as a pathologist. one in particular said he went to work in Fiji for a year . . . go figure
so, i'm not sure if i even grazed the info you were looking for. so take what i wrote for what its worth . . .
cheers