What type of surveillance plan should one use to follow a young person after orchiectomy for a >3cm pure mature teratoma of the testicle?

I presume hCG and AFP were normal as well as appropriate imaging studies, thus a clinical stage I pure teratoma. These patients have a 25% probability for relapse and should be on regular surveillance. We have published on this topic previously. We prefer studies ( serum hCG, AFP, abdominal CT scan ...