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Canine Mast Cell Tumors

Jul 26, 2018

Mast cell tumors (MCT) are the most common malignant skin tumors in dogs and among the most common tumors overall. MCT most commonly occur as solitary lumps or masses in the skin and occasionally dogs can have multiple MCTs. These tumors can have a very variable appearance--they can resemble fatty (lipomatous) masses or may be reddened (erythematous) and/or ulcerated. MCT may change quickly, often waxing and waning in size  (become larger, then smaller). They do this because mast cells contain granules of histamine, heparin and other chemicals that when released into the body can cause swelling, redness, and increased stomach acid production.