It could be neurological, nerve damage doesn't means paralysis, and I've seen rats that are paralyzed from the waist down heal and walk again. What I mean is that there are different levels of nerve damage.
Anyway, I'm glad that it healed on it's own, it's true that with an animal so small, there is little a vet could do about it, usually just make sure that it's eating and drinking, urinating and defecating and that's about it.
Anyway, I'm glad that it healed on it's own, it's true that with an animal so small, there is little a vet could do about it, usually just make sure that it's eating and drinking, urinating and defecating and that's about it.