Kaplan, MKlein, EA2024-06-122024-06-1220051743-4270https://doi.org/10.1038/ncpuro0295https://hdl.handle.net/20.500.14551/19072Background A 33-year-old male presented to hospital with a painless right testicular mass measuring 2 x 3 cm and no systemic symptoms. The patient had no relevant medical history. CT and blood tests did not reveal metastasis and the patient was treated with a right inguinal orchiectomy and radiotherapy. After 4 years a routine follow-up examination revealed a 1 cm, palpable mass in the left testis. Investigations CT, tumor marker assessment, scrotal ultrasonography, Doppler ultrasound examination, and biopsy. Diagnosis Bilateral metachronous testicular seminoma, stage Pt1N0M0S0. Management Radiotherapy, radical orchiectomy, bilateral placement of testicular prostheses, androgen substitution therapy, regular follow-up assessment.en10.1038/ncpuro0295info:eu-repo/semantics/closedAccessBilateralGerm-Cell TumorMetachronousSeminomaTestisGerm-Cell TumorsCancer-CenterMicrolithiasisExperienceArticle29457460N/AWOS:0002318923000142-s2.0-2714451624316474684N/A