Merck Manual

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Apocrine gland tumor of anal sac origin
Apocrine gland tumor of anal sac origin

This mass is being surgically debulked. Intracavitary chemotherapy with 5-fluorouracil mixed with the animal's serum may help local control. Follow-up radiation therapy, intralesional chemotherapy, or systemic chemotherapy may increase the tumor-free interval.

Courtesy of Dr. Alice Villalobos.