[Value of sonographic diagnosis in retroperitoneal teratoma in adults]

A 56-year old man was admitted with a tumour-like lesion located in the retroperitoneal space with adherence to the left adrenal gland. An extensive diagnostic procedure could neither establish the diagnosis nor differentiate the lesion from the adrenal gland. After tumour biopsy by ultrasound surgery was recommended and performed and the final diagnosis--mature teratoma--was established. In this article we discuss the genesis and therapeutic possibilities of mature teratoma in adults.