The medical records of 4 dogs with histologically confirmed intranasal mast cell tumors (MCTs) were retrospectively evaluated to determine their biological behavior. Information on signalment, presenting clinical signs, tumor grade, treatment administered, and survival times was obtained from the medical record. All 4 patients had high grade tumors and received chemotherapy. Survival times ranged from 27 to 134 days. All 4 dogs showed signs of local or distant disease progression, suggestive of an aggressive behavior of intranasal MCTs.
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