Late testicular relapse two decades after primary extragonadal germ cell tumor with uncommon metastases: a case report.

Background: Extragonadal germ cell tumor (EGCT) is a relatively rare condition, reportedly representing 3-7% of all germ cell tumors. We report a patient who had metachronous testicular tumor with uncommon metastases 20 years after primary retroperitoneal EGCT treatment, along with a corresponding literature review.

Case Presentation: A 49-year-old Japanese man visited our department in November 2017 with chief complaints of indolent right scrotum enlargement and a right inguinal mass.