our review , which represents the combined experience of two children 's hospitals over several decades , did not include tumors such as malignant mesothelioma , lipoma , liposarcoma , leiomyoma , mesenchymoma , fibromatosis , and other neoplasms , which may rarely arise in the peritoneum , omentum , and mesentery of children .
C0006826
tumors
C0027651
neoplasms