16 Questions
What is the primary reason to perform an incisional biopsy?
To determine the tumor type and its prognosis to inform treatment decisions
What type of tumor is also called Sticker tumor and infectious sarcoma?
Canine transmissible venereal tumor
What is a characteristic of a histiocytoma in dogs?
It is a benign tumor that may regress on its own
Which of the following is a reason to perform surgical removal of a histiocytoma?
If the tumor does not regress or grows rapidly
What is the main role of histiocytes in the body?
Part of the immune system
What is the primary mode of transmission of Canine transmissible venereal tumor?
Through copulation
What is a common location for Canine transmissible venereal tumor?
External genitalia
What is the purpose of identifying the tumor type and its prognosis?
To inform the owner's willingness to pursue curative-intent treatment
What is the treatment of choice for intranasal cancers in dogs and cats?
Radiation therapy
What is the response rate of chemotherapy alone in treating tumors?
30%
Why should chest x-rays be taken before surgical removal of a mammary tumor?
To rule out metastasis
What is the goal of surgical removal of a histiocytoma?
To remove the tumor with wide margins
What is the prognosis for lymphoma?
Long remission times are possible with chemotherapy
What is the importance of identifying the tumor type?
To determine the prognosis
What is the characteristic of a histiocytoma?
It is a type of histiocytic tumor
What is the primary goal of treatment for tumors?
To achieve long remission times
Study Notes
Tumor Diagnosis and Treatment
- Incisional biopsy is necessary to determine the tumor type and prognosis, which affects the owner's decision to pursue curative-intent treatment.
- Canine transmissible venereal tumor (CTVT) is a histiocytic tumor that affects the external genitalia of dogs and other canids, transmitted through copulation.
Types of Tumors
- Cutaneous histiocytoma is a benign tumor that can regress within 2-3 months, but surgical removal may be necessary if it doesn't regress or grows rapidly.
- Lymphoma is a type of cancer with rare complete cure, but long remission times are possible with chemotherapy.
- Nasal adenocarcinoma is a type of cancer that responds well to radiation therapy in dogs and cats.
- Inflammatory mammary CA is a type of cancer that requires surgical removal with wide margins to prevent recurrence.
- Metastases present is a condition where cancer has spread to other parts of the body.
Treatment Approaches
- Chemotherapy alone has a 30% response rate and responses are usually short-lived.
- Radiation therapy is the treatment of choice for intranasal cancers in dogs and cats.
- Surgical removal is the treatment of choice for certain types of cancer, but chest x-rays should be taken first to rule out metastasis.
Diagnostic Plan for Neoplasia
- The diagnostic plan includes differential diagnosis, description and documentation, identification, grading, staging, assessing overall health, and treatment planning.
- A surgical plan may be indicated in certain cases.
Surgical Plan
- The most common mistake in oncologic surgery is not being aggressive enough on the first excision.
- The first excision is the best chance for a cure.
Quiz on veterinary oncology, focusing on biopsy and treatment decisions for pet owners. Covers importance of tumor type and prognosis in treatment planning.
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