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histiocytoma

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histiocytoma /his·tio·cyt·oma/ (his″te-o-si-to´mah) a tumor containing histiocytes (macrophages).
benign fibrous histiocytoma  any of a group of benign neoplasms occurring in the dermis and characterized by histiocytes and fibroblasts; the term sometimes encompasses several types of neoplasms, such as dermatofibroma, nodular subepidermal fibrosis, and sclerosing hemangioma and sometimes is synonymous with one of these.
malignant fibrous histiocytoma  any of a group of malignant neoplasms containing cells resembling histiocytes and fibroblasts.

his·ti·o·cy·to·ma (hst--s-tm)
n. pl. his·ti·o·cy·to·mas or his·ti·o·cy·to·ma·ta (-m-t)
A tumor composed of histiocytes.

histiocytoma [his″te-o-si-to´mah]
a tumor containing histiocytes.

histiocytoma
a tumor containing histiocytes.
Enlarge picture
Histiocytoma. By permission from Kummel BA, Color Atlas of Small Animal Dermatology, Mosby, 1989

atypical histiocytoma
Merkel cell tumor.
benign cutaneous histiocytoma
multiple, dermal histiocytic nodules in young dogs; no clinical significance, eventually disappear.
transmissible histiocytoma
canine transmissible venereal tumor.


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There are 4 types of spindle cell sarcoma: undifferentiated sarcoma of bone, malignant fibrous histiocytoma, fibrosarcoma and leiomyosarcoma.
In all of the major series of sarcomatoid RCCs2,3,7 and the other isolated reports4,8 and short series,9-11 consisting of about 275 cases of sarcomatoid change in RCC, the sarcomatoid component resembles a malignant tumor of mesenchymal differentiation, such as fibrosarcoma, malignant fibrous histiocytoma, or undifferentiated sarcoma.
The commonest soft-tissue malignancies are synovial sarcoma, liposarcoma and malignant fibrous histiocytoma.
 
 
 
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