"우리 엄마께서 뇌외과 의사이세요."
Translation:My mom is a brain surgeon.
I've always had the understanding that neurosurgeons worked on any nerves and brain surgeon was a colloquial term for those that superficially work on the brain, but I could be wrong; I'm just n engineer.
Many medical professions have at least two (sometimes more) names in English. Same with a lot of diagnoses.