Rhabdomyosarcoma in Dogs
Rhabdomyosarcoma is a form of soft tissue cancer found in dogs, characterized by malignant, aggressive tumors that easily spread throughout the body. These tumors originate from striated muscles, which are the banded muscles found in skeletal and cardiac tissue. In adult dogs, rhabdomyosarcomas typically arise from existing muscle tissue, while in juveniles, they originate from embryonic stem cells.
These tumors commonly occur in various locations such as the larynx (voice box), tongue, and heart. They have a propensity for aggressive metastasis, spreading to distant sites in the body. Metastasis can occur in organs such as the lungs, liver, spleen, kidneys, and adrenal glands.
It’s important to note that this medical condition can affect both dogs and cats.
Symptoms
- Presence of a sizable, widespread, soft tissue mass, typically originating from skeletal muscle
- Potential infiltration into the primary muscle, leading to the formation of multiple nodules
- In cases where the tumor affects the heart, signs of right-sided congestive heart failure may manifest
Causes
Idiopathic origin, meaning the cause is unknown.
Diagnosis
Your veterinarian will conduct a comprehensive physical examination, which includes a chemical blood profile, complete blood count, urinalysis, and electrolyte panel. Providing a detailed history of your dog’s health prior to symptom onset is essential. While a cytologic examination of a fine-needle aspirate sample might indicate cancer, a definitive diagnosis requires a surgical biopsy (tissue sample).
Treatment
To achieve a cure, surgical removal of the tumors or nodules is recommended, although the invasive and expansive characteristics of this tumor may render it unresectable. Consideration should be given to amputation of the affected limb if primarily involved. Radiotherapy might offer assistance, especially if complete removal of the tumor was not feasible.
Living and Management
Your veterinarian will arrange monthly follow-up appointments for the first three months after the initial treatment. Subsequent appointments can be scheduled every three to six months thereafter. If your dog undergoes tumor removal surgery, diligent monitoring of the surgical site is necessary until complete healing occurs. Your veterinarian will provide instructions on proper cleaning and dressing techniques for the sutured area. Promptly contact your veterinarian if you notice any signs such as oozing, drainage, swelling, or redness at the surgical site. Don’t hesitate to reach out to your veterinarian with any questions or concerns.
