Acromegaly is another name for giantism, or they are very close in symptoms. I think acromegaly is the overgrowth of bone and cartilage that usually leads to arthritis. Its like a release of too many hormones or something. And it makes bones longer, causes snorning etc. But it doesnt effect the internal organs i believe.

I'll look up disease in this medical book i have if you can't find it.