"우리 엄마께서 뇌외과 의사이세요."
Translation:My mom is a brain surgeon.
There's also 뇌신경외과 ("neurosurgery, brain surgery") besides 뇌외과 ("brain surgery, neurosurgery") for the specialty of neurosurgery (신경 외과). As "brain surgery" sounds too informal, I'd want to invent cerebrosurgery and cerebroneurosurgery respectively for those, but the problem is 'cerebrum' is used technically nowadays for only one part of the brain, as opposed to the cerebellum and medulla. This is why people refuse to translate things medical . . .