[Benign enlargement of the thymus after chemotherapy of metastasizing testicular cancer].

A young male with retroperitoneal recurrence of a germ cell tumour was successfully treated with chemotherapy. Four months after the last treatment a CT scan revealed hyperplasia of the thymus. A year after the last treatment the CT scan shows regression. A review of the literature demonstrates that 10% of patients treated for germ cell tumours develop a benign, reversible hyperplasia of the thymus within two years after treatment. Thus, benign hyperplasia of the thymus should be considered if a patient treated for germ cell tumour develops a tumour in the anterior mediastinum within two years.