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Mast cell tumors are known among veterinary oncologists as 'the great pretenders' because their appearance can be varied, from a wart-like nodule to a soft subcutaneous lump (similar on palpation to a benign lipoma) to an ulcerated skin mass. Most mast cell tumors are small, raised lumps on the skin. They may be hairless, ulcerated, or itchy.
In about one fifth of the dogs with a mastocytoma, feeding instability, vomiting, tarry stools and anemia occur as a result of gastric or duodenal ulcers, [10] in autopsies such ulcers are even detected in more than 80% of patients. [18] About 80% of the dogs with such ulcers are euthanized due to poor general condition. [19]
[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. [ 47 ] [ 48 ] However, a pedunculated lipoma can cause entrapment and torsion of the intestine in horses, causing necrosis, colic, and possibly death.
Soft tissue sarcoma refers to a broad group of tumors that originate from connective tissues. They tend to have similar histologic appearance and biological behavior, and can be either benign or malignant. Soft tissue sarcomas can arise in any part of the pet's body but skin and subcutaneous tumors are the most commonly observed.
The mammary glands in dogs and cats are associated with their nipples and extend from the underside of the chest to the groin on both sides of the midline. There are many differences between mammary tumors in animals and breast cancer in humans, including tumor type, malignancy , and treatment options.
Aggressive fibromatosis, also known as desmoid fibromatosis, a type of non-metastasizing soft-tissue sarcoma, may occur in dogs. [167] Squamous cell carcinoma* is a malignant tumor in dogs that most commonly occurs in the oral cavity, including the tongue, tonsils, and gingiva. Squamous cell carcinoma accounts for 5 percent of skin tumors in ...
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They may feel soft or firm. [3] [4] Cause and risks. The bumps are caused by pressure. [1]
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