Mixed testicular germ cell tumour in a patient with previous pineal germinoma.

Germ cell tumours (GCT) are a relatively common malignancy in men aged 15-35 years. They occur most frequently in the gonads, but 3-5% have extragonadal origin, mainly in the pineal gland, neurohypophysis, mediastinum and retroperitoneum. Although intracranial germinomas may present with synchronous midline lesions, development of metachronous testicular germ cell primaries seems to be extremely rare, and confirmed dissemination of intracranial GCT to the testes has never been reported.