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  • Title: Malignant fibrous histiocytoma and malignant histiocytosis in the dog--convergent or divergent phenotypic differentiation?
    Author: Kerlin RL, Hendrick MJ.
    Journal: Vet Pathol; 1996 Nov; 33(6):713-6. PubMed ID: 8952034.
    Abstract:
    Malignant fibrous histiocytoma (MFH) and malignant histiocytosis (MH) are neoplasms with different histologic appearances and consequently a different putative cell of origin. Recently, the biopsy and necropsy services at the University of Pennsylvania have seen many canine soft tissue sarcomas that have the gross and histologic appearances of both MH and MFH within the same animal. A retrospective histologic evaluation of 263 cases diagnosed originally as either MH or MFH reclassified these neoplasms into 77 cases that were exclusively MH, 110 cases exclusively MFH, and 76 cases with features of both MH and MFH. Age, sex, breed predispositions, and distribution of lesions in organs were remarkably similar between the two categories. The hybrid neoplasms containing MH-like and MFH-like regions may be the result of divergent or convergent phenotypic differentiation.
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