Given the task definition and input, reply with output. Given an abstract, indicate which of the provided candidate titles (Option1 and Option2) best describes it (respond with the text of the title, not option1/2).

Abstract: A case of intradural metastasis from endometrial carcinoma to the cauda equina is presented. The clinical presentation and radiographic findings were misleading and suggested a herniated nucleus pulposus. Findings at operation were most suggestive of an ependymoma, but final pathological diagnosis revealed endometrial carcinoma. This has never been reported. Once again it demonstrates that surgeons managing lumbar disc disease must be prepared for possible intradural exploration with an appropriate team.
Which is the apt title for the abstract? option1: Unusual metastasis to the cauda equina: case report. option2: Selective chemical catalysis by an antibody.
Unusual metastasis to the cauda equina: case report.