Definitions for "Histiocytoma"
Benign skin tumor composed of histiocytes (tissue macrophages).
a common neoplasm of young dogs composed of round histiocytic cells, thought to be Langerhan's cells. Most tumors spontaneously regress.
A histiocytoma in the dog is a benign tumor that originates from histiocytes. most likely epidermal Langerhans cells of antigen-presenting cell lineage. Most commonly histiocytomas are found in young dogs and appear as a small, solitary, hairless lump. Ulceration of the mass is common.