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Germ cell tumors (GCTs) are a common malignancy in males, with variations in differentiation making different therapeutic strategies necessary. Generally, GCTs show good curation rates due to their good response to radiotherapy or chemotherapy. However, certain subtypes are resistant to these therapies and require surgery. We present a case of a 25-year-old patient with a large retroperitoneal GCT with somatic malignant transformation, where resection of large abdominal blood vessels with complex reconstruction was necessary to completely remove the tumor. The tumor was completely resected, and the patient has since been recurrence-free in the follow-up period. GCTs with somatic transformation show high resistance rates to chemo- and radiotherapy, and the patient in the presented case study did indeed show only a limited response to carboplatin-based chemotherapy. Patients suffering from these conditions should be resected whenever possible, as curation can be achieved by complete tumor resection. Infiltration of neighboring structures is no contraindication to surgery. The case presented here shows that interdisciplinary surgical planning including vascular and general surgeons as well as radiologists is vital to ensure successful tumor resection.