Mammary tumor recurrence in bitches after regional mastectomy

Veterinary Surgery : VS
Nina StratmannAxel Wehrend

Abstract

To investigate the histologic diagnosis and incidence of new mammary tumor growth in the remaining mammary chain tissue after regional mastectomy. Prospective clinical study. Female dogs (n=99) that had excision of a single mammary tumor. Female dogs that had regional mastectomy to remove a single tumor were followed for >or=1 year postoperatively. Data regarding tumor type, tumor recurrence, and development of metastasis were recorded. Fifty-seven (58%) dogs developed a new tumor in the ipsilateral mammary chain after the 1st surgery; 77% had repeat surgery. There was no significant correlation between the time to new tumor development and the histologic diagnosis for the 1st and 2nd tumor types. In 31 dogs, the histologic diagnosis for initial and subsequent tumors was identical and there was a significant correlation such that dogs with an initial malignant tumor are likely to develop another malignant tumor (P=.0089). The histologic classification of the new tumor was likely to be malignant if it was located close to the side where the initial tumor had been removed (P=.026). Our results show that 58% of dogs developed a new tumor in the remaining mammary glands of the ipsilateral chain after regional mastectomy for removal...Continue Reading

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