@article{oai:sapmed.repo.nii.ac.jp:00014211,
 author = {Mitaka, Toshihiro and Satoh, Masaaki and Isobe, Masato and Akiyama, Morifumi and Ishitani, Kunihiko and Minase, Takashi and Mochizuki, Yohichi},
 journal = {Tumor Research, Tumor Research},
 month = {},
 note = {A rare case of malignant mesenchymoma of a retroperitoneal lesion, com-posed of liposarcoma and osteosarcoma, is reported. For complete resection of the tumor, two surgical operations were performed. The first operative material showed a mass measuring 20 x 20 x 10 cm, weighing 1607g, arising from the soft tissue of the left retroperitoneum and the tumor had a smooth surface and elastic-hard consistency. The secondary operative materials exhi-bited a mass measuring 10 x 5 x 3 cm, weighing 268g. The tumor was com-posed of soft gelatinous tissues and adhered to the tail of the pancreas but was separate from the spleen. More than 3 years after the secondary operation, no recurrence has been observed. Immunohistochemical examinations showed that S-100 protein and non-specific enolase were present in the liposarcoma-tous area and that vimentin was positive in the osteosarcomatous area.},
 pages = {27--34},
 title = {A Case of Retroperitoneal Malignant Mesenchymoma},
 volume = {33},
 year = {1998}
}