title: Ossifying fibromyxoid tumor of the retroperitoneum.
abstract: A case of ossifying fibromyxoid tumor (OFMT) in an unusual site, the retroperitoneum, in a 71 year old Japanese man is reported. The well demarcated tumor contained a large amount of mature bony tissue within the tumor. The tumor cells were round to spindle-shaped, and showed a high cellularity in some areas and were loosely arranged in other areas. Although the majority of tumor cells expressed vimentin, neuron specific enolase and Leu-7, there were no tumor cells positive for S-100 protein, myogenic or epithelial markers. We would like to emphasize that tumors classified as OFMT contain a wide spectrum of histologic features and heterogeneity.
authors.affiliation: Department of Pathology, Yamagata University School of Medicine, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Motoyama
authors.forename: A
authors.initials: A
authors.lastname: Ogose
authors.forename: H
authors.initials: H
authors.lastname: Watanabe
mesh_terms: D000368:Aged; D000951:Antigens, Neoplasm / Q000032:analysis; D014408:Biomarkers, Tumor / Q000032:analysis; D018214:Fibroma, Ossifying / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D012186:Retroperitoneal Neoplasms / Q000737:chemistry / Q000473:pathology* / Q000601:surgery
chemical_list: D000951:Antigens, Neoplasm; D014408:Biomarkers, Tumor