OUR SERVICES
Anal Sac Disorders
ABOUT ANAL SAC DISORDERS
Anal sacs are two small pouches located on either side of the anus.
These sacs are lined with glandular cells that produce pungent secretions which can be released during times of stress, regional irritation or during defecation.
Common Anal Sac Conditions
Infections and cancers are the two primary concerns associated with anal sacs.
Anal Sacculitis due to infections involve recurrent swelling, pain, or abscess formation, causing significant discomfort. Surgical removal (anal sacculectomy) may be recommended for pets with frequent infections to eliminate the recurring discomfort and avoid the risk of antibiotic resistance associated with prolonged use.
Cancers such as apocrine gland anal sac adenocarcinoma (AGASACA) can have similar clinical signs to anal sacculitis, but are more severe and concerning. AGASACA accounts for approximately 17% of perianal cancers and 2% of all skin and subcutaneous tumors, typically affecting dogs between 9 and 11 years of age.
Signs and Diagnosis of AGASACA
AGASACA often presents as a swelling in the perianal region and may be associated with scooting and or straining to defecate. A mass may also be palpated during a routine rectal exam in a patient with no clinical signs asscoaited with their anal sacs.
Initial diagnosis of an AGASACA in done by rectal examination and palpation of the anal sacs for any abnormalities. A Fine needle aspirate may be performed to further confirm the concern of an AGASACA.
Since AGASACA have spread in 50-80% of cases by diagnosis, thorough staging is strongly recommended. This may include chest x-rays and abdominal ultrasound with assessment of sublumbar lymph nodes—the most common sites of metastasis. These lymph nodes, located in the caudal abdomen and pelvis, can sometimes cause tumor extension to adjacent vertebrae or distant organs such as the liver, spleen, or lungs. Advanced imaging with CT may be recommended in complex cases.
Treatment options for anal sacculitis and AGASACA: Surgery
Surgical removal of the affected anal sacs is the primary approach for both cases of anal saculitis and AGASACA. The goal of surgery is the compelte removal of the anal sac and all associated glandular tissue. If an mass is present complete tumour removal with wide margins is ideal, however, the proximity to vital neurovascular structures and the rectum frequently necessitates marginal excision.
In cases of AGASACA, once the mass has been removed ongoing monitoring as well as the implementation of a chemotherapy or radiation therapy plan is advised.
Anal Sacculectomy Recovery and Postoperative Care
Most surgical wounds heal within two weeks. Pets should remain confined and avoid vigorous activity for approximately four weeks. Short, supervised walks for toileting are recommended every 4-6 hours. Stool softeners and prescribed medications, including antibiotics and anti-inflammatories, should be administered as directed.
For dogs undergoing treatment for recurrent infections, follow-up care is typically minimal once wounds have healed. For dogs treated for AGASACA, oncology consultation is recommended to discuss chemotherapy and further management options.
Final Thoughts
Anal Sacculitis is a less serious condition compared to AGASACA, but it can be a very painful reoccurring condition. Fortunately, managements by removal of the glands is associated with minimal complications and resolves the condition for the rest of your pet’s life.
AGASACA is a serious condition requiring comprehensive management to address both the local tumour and potential metastasis. Although aggressive treatments yield the most favourable outcomes, less intensive therapies can still improve quality of life and provide meaningful time with pets. Early detection and multimodal care remain critical for the best possible prognosis.
If you’re concerned about your dog’s anal sacs—whether they’re scooting, straining to poop, or you’ve noticed a lump—don’t hesitate to reach out. We’ll guide you through the diagnosis and treatment process to ensure your pet gets the best possible care.
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