Hi,
Thank you for posting your query.
There are good chances that your 
sacrococcygeal teratoma has not recurred, as there is no visible swelling or lump in the area. Pain can also be due to other causes.
However, if it has returned, then surgery is the best option to prevent it from recurring in the future.
I hope it helps.
Please get back if you require any additional information.
Best wishes,
Dr Sudhir Kumar MD (Internal Medicine), DM (Neurology)
Senior Consultant Neurologist
Apollo Hospitals, Hyderabad,
My personal URL on this website:  http://bit.ly/Dr-Sudhir-kumar 
My email: drsudhirkumar@yahoo.com