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Most commonly histiocytomas are found in young dogs and appear as a small, solitary, hairless lump, [6] although Shar Peis may be predisposed to multiple histiocytomas. [7] They are most commonly found on the head, neck, ears, and limbs, and are usually less than 2.5 cm in diameter. [8] Ulceration of the mass is common.
A mastocytoma in dogs (or mast cell tumor in dogs) is a neoplasm originating from mast cells in the domestic dog, which occurs mainly in the skin and subcutis. Mastocytoma are not only extremely common in dogs, but also tend to be much more malignant in them than in other animal species.
Two types of mast cell tumors have been identified in cats, a mast cell type similar to dogs and a histiocytic type that appears as subcutaneous nodules and may resolve spontaneously. Young Siamese cats are at an increased risk for the histiocytic type, [ 2 ] although the mast cell type is the most common in all cats and is considered to be ...
Thyroglossal cysts can be defined as an irregular neck mass or a lump which develops from cells and tissues left over after the formation of the thyroid gland during developmental stages. [ 1 ] Thyroglossal cysts are the most common cause of midline neck masses and are generally located caudal to (below) the hyoid bone.
Osteosarcoma is the most common bone tumor in dogs and typically affects middle-aged large and giant breed dogs such as Irish Wolfhounds, Greyhounds, German Shepherds, Rottweilers, mountain breeds (Great Pyrenees, St. Bernard, Leonberger, Newfoundland), Doberman Pinschers and Great Danes. It has a 10-fold greater incidence in dogs than humans. [33]
The multilobular tumour of bone (MTB), also called an osteochondrosarcoma, is the most common tumour of the canine skull, [1] although it is relatively rare in general. MTB usually presents as a firm, circumscribed and generally slowgrowing bone tumour in older dogs from medium or large breeds. Its biological behaviour may range from benign to ...
After having chronic sinus problems, Glenn Moog noticed a little bump on his neck. He thought his lymph nodes had become swollen. About five months after noticing it, he visited his doctor.
Overweight female dogs are especially prone to developing these tumors, and most older or overweight dogs have at least one lipoma. [46] [47] In dogs, lipomas usually occur in the trunk or upper limbs. [45] They are also found less commonly in cattle and horses, and rarely in cats and pigs.