title: Malignant fibrous histiocytoma showing cytoplasmic hyaline globules and stromal osteoids. A case report with light and electron microscopic, histochemical, and immunohistochemical study.
abstract: A 56-year-old man died of widespread metastases of malignant fibrous histiocytoma (MFH) primarily developed in the left lower gingiva after a rapid clinical course is reported. Primary and metastatic tumors showed light and electron microscopic, histochemical and immunohistochemical characteristics of MFH together with cytoplasmic hyaline globules and stromal osteoids. Hyaline globules revealed periodic acid-Schiff positive and diastase resistant reactions but not positive with any histochemical and immunohistochemical reactions. Osteoids were partially calcified and rimmed by osteoblastic tumor cells. The present case of MFH may provide difficulties in the differential diagnosis from some osteoid-forming sarcomas in soft tissues with relation to the histogenesis.
mesh_terms: D005347:Fibroblasts / Q000648:ultrastructure; D005887:Gingival Neoplasms / Q000473:pathology* / Q000648:ultrastructure; D006644:Histiocytes / Q000648:ultrastructure; D018219:Histiocytoma, Benign Fibrous / Q000473:pathology* / Q000556:secondary / Q000648:ultrastructure; D006651:Histocytochemistry; D006801:Humans; D007124:Immunoenzyme Techniques; D002479:Inclusion Bodies / Q000648:ultrastructure*; D008297:Male; D008854:Microscopy, Electron; D008875:Middle Aged