1) Bovine disease 2) Dog disease 3) Horse disease 
A mastocytoma or mast cell tumor is a type of round-cell tumor consisting of mast cells. It is found in humans and many animal species; in human medicine it also can refer to an accumulation or nodule of mast cells that resembles a tumor. Mast cells originate from the bone marrow and are normally found throughout the connective tissue of the body ...
A growth or lump of mast cells (a type of white blood cell). Mast cell tumors can involve the skin, subcutaneous tissue, and muscle tissue. Also called mast cell tumor.
<oncology, tumour> Neoplastic mast cells. ... (18 Nov 1997) ... 
(mas″to-si-to´mә) a benign, local aggregation of mast cells forming a nodular tumor.
Neoplastic mast cells.
Type: Term Pronunciation: mas′tō-sī-tō′mă Definitions: 1. A fairly well-circumscribed accumulation or nodular focus of mast cells, grossly resembling a neoplasm.
Mastocytoma: A form of mastocytosis characterized by a benign nodular skin tumor infiltrated by mast cells. Usually present at birth or in early childhood and resolves spontaneously. Also called a mast cell tumor.
Mastocytomas are localized collections of mast cells. Typically .5 to 1.5 cm in diameter, they have a yellow-red-brown color. Stroking the lesion elicits an urticarial response, Darier's sign. Extensive mast cell involvement of the skin is called urticaria pigmentosa.