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Excision of a right anal sac carcinoma, intraoperative views a (left) marginal dissection of the caudal aspect of the tumour b dissection is carried out cranially along the lateral aspect of the tumour until it can be rotated caudally, exposing the rectal wall (arrow), from which it is progressively detached by a combination of blunt and sharp dissection. Causes of anal sac adenocarcinoma in dogs when mutations occur to the dna within cells, they can cause cells to grow uncontrollably. Anal glands are located on either side of the anus and normally produce secretions that are pushed when feces is evacuated from the rectum. An anal sac tumor is a tumor of made up of cells originating from the glands of the anal sac. These tumors can spread and therefore staging is recommended prior to surgery. To diagnose these tumors, a fine needle aspirate can be placed from the outside and. Anal gland adenocarcinoma (aga) (also known as apocrine gland anal sac carcinoma adenocarcinoma or anal sac adenocarcinoma) is an uncommon cancer that arises from the apocrine glands in the walls of the anal sacs. In 50 of the canine cases of apocrine gland adenocarcinoma, enlarged lymph nodes are found in the abdomen. But what he thought was anal sac carcinoma from feeling it and that if thats the case it was likely she would only live 2-3 months. There is an increased incidence of anal sac adenocarcinoma in older, spayed female dogs, but a sex predilection has not been confirmed (goldschmidt and shofer, 1992). The majority of cases involve dogs, but occasional cases have been reported in cats. Grossly, this is a subcutaneous mass, firmly fixed around the anal sac that arises from the glands in the wall of these sacs. Anal sac apocrine gland adenocarcinoma is locally invasive and typically affects one anal sac however, bilateral tumors can occur. 4 the metastatic potential is reported to be between 50-80 at initial presentation, most commonly to the regional sublumbar and pelvic lymph nodes. 5,6 sites of the distant metastatic disease include the liver, lungs, spleen, bone and less commonly, heart. An anal sac adenocarcinoma is an uncommon and aggressive malignant tumor found in dogs that arises from the apocrine glandular tissue of anal sac. The disease exists in cats as well, but is much less common in that species. They are the second most common cancerous cause of hypercalcaemia (high serum calcium) in dogs, following t-cell lymphoma.