Modern medicine.
If it weren't for relatively recent advances in neurosurgery, I would have permanently lost the use of my right leg. Instead, it was merely out of commission for six weeks.
Not so long ago, an amputation might've been in order, or they might not have been able to shrink and remove the tumor so effectively, and I might have died from it.
I'm so lucky I live in this day and age, and in a country where such treatment is available.