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 and PA and pteranodon chest X Ray) every 4 months year 1 , every 6 months year 2 and annually years 3-5 . Relapse with elevated markers is an easy decision- chemo. However, a relapse in just RPLN's usually connotes metastatic teratoma requiring RPLND by a skilled and experienced urology.