Today I learned the medical name for these humps is kyphosis and it is one of the known long-term medical consequences of castration in males. It's due to osteoporosis (thinning/brittle bones) and is also seen in elderly women - the vertebral bodies in their spines collapse in on themselves leading to the hump. So these castrated males not only are NOT women, they're also fucking themselves over medically.
There are medical journal articles on this: https://academic.oup.com/jcem/article/84/12/4324/2864451
Keffals and Donger should donate their carcasses to science. It would be the only useful thing either one of them do.
le hump
keffals' hump is more advanced probably due to him castrating himself at a younger age
This is what the Donger has to look forward to.
Source