Intrathoracic congenital fibrosarcoma. A case report.

Congenital fibrosarcoma is a rare tumor that usually presents as a mass lesion involving the arm or leg of a neonate. No ultrasonographic description of such a neoplasm in the prenatal period has been reported. We present the sonographic findings of a tumor, discovered in an unusual site in utero, that, on postmortem examination, was demonstrated to be a fibrosarcoma.