Embryonal carcinoma in a cryptorchid testis of a 3-year old.

The undescended testis is at an increased risk of malignant transformation. Almost all such tumours occur in the second to fourth decades of life and are usually seminomas. A case of a mixed germ-cell tumour with yolk sac and embryonal carcinoma components arising in one of the hitherto uncorrected bilateral cryptorchid testes of a3-year old child is presented.