In 17 cases of transitional cell carcinoma in cats the most common site for primary neoplasia was the urinary bladder; metastasis was recorded in five of the cases. Nine of the cases have been reported previously; the eight additional carcinomas from the files of the New York State College of Veterinary Medicine were highly invasive and had a desmoplastic response. According to WHO guidelines they were classified as nonpapillary, infiltrating; papillary, infiltrating; and variants of transitional cell carcinoma.
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