Gamma knife radiosurgery-induced intracranial aneurysms: A case series and literature review

• GKS-induced intracranial aneurysm is very rare as a late side effect. • We report 4 cases of GKS-induced intracranial aneurysm, and conduct a literature review. • The incidence of bleeding in GKS-induced intracranial aneurysm was high, but the clinical outcomes after treatment were relatively excellent. • Long-term follow-up monitoring of intracranial aneurysm occurrence after GKS is important.