Malignant soft tissue tumors of probable histiocytic origin (malignant fibrous histiocytomas): General considerations and electron microscopic and tissue culture studies

Authors

  • Yao-Shi Fu MD,

    1. Division of Surgical Pathology, Department of Pathology, College of Physicians and Surgeons, Columbia University, New York, NY
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    • Chief Resident Surgical Pathology. Current position: Assistant Professor of Surgical Pathology, Medical College of Virginia, Richmond, VA.

  • Giulio Gabbiani MD,

    1. Division of Surgical Pathology, Department of Pathology, College of Physicians and Surgeons, Columbia University, New York, NY
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    • Professor of Pathology, the Department de Pathologie, Faculté de Medicine, Université de Genève, Genève, Switzerland.

  • Gordon I. Kaye PHD,

    1. Division of Surgical Pathology, Department of Pathology, College of Physicians and Surgeons, Columbia University, New York, NY
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    • Associate Professor of Surgical Pathology; recipient of Research Career Development Award KO-4-AM-70333 from the NIAMDD, NIH, USPHS.

  • Raffaele Lattes MD

    Corresponding author
    1. Division of Surgical Pathology, Department of Pathology, College of Physicians and Surgeons, Columbia University, New York, NY
    • College of Physicians and Surgeons, Columbia University, 630 West 168 Street, New York, NY 10032
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    • Professor of Surgical Pathology.


Abstract

Correlated light and electron microscopic study of four fibrous histiocytomas of proven malignancy has confirmed the presence of histiocyte-like and fibroblast-like cells in this tumor. In addition, an undifferentiated cell type, giant cells, xanthomatous cells, and rare cells with morphological characteristics intermediate between those of histiocytes and fibroblasts were seen. “Nuclear body” type inclusions were commonly present in both principal cell types in all four cases, as were the somewhat less common cytoplasmic inclusion bodies. Electron microscopic study of a tissue culture of one of these tumors demonstrated only fibroblast-like, histiocyte-like, and xanthomatous cells. The possibility is suggested that both principal cell types in this tumor may derive from the same undifferentiated stem cell.

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