Retroperitoneal malignant teratoma. A case report.

Retroperitoneal teratomas are rare in adults. These tumours may be benign or malignant and are composed of multiple tissues foreign to the part in which they arise. We report a malignant teratoma of retroperitoneal space. In searching the literature, we have been able to find 39 cases reported since 1937. Of the forty cases reported (including this case), only ten (25%) were malignant.