31 children with intraperitoneal masses were operated upon during a 10 year period between 1975 to 1985 , 15 tumors were malignant ( 3 hepatoblastomas , 6 nhl , 3 rms , 1 mesothelioma , 1 teratocarcinoma of the ovary , 1 haemangioendothelioma of the liver ) .
C0577559
masses
C0027651
tumors