Biologic Behaviour
•tonsillar SCC associated with environmental pollution as 10-times more common in urban areas
•tonsillar SCC are usually plaque or cauliflower lesions involving 1 tonsil
•cervical lymphadenopathy is a common signs (ipsilateral, contralateral, or bilateral)
•metastasis to the regional lymph node in 98% and lungs in 63% dogs
•other tonsillar tumors:
•LSA (usually bilateral and associated with generalized lymphadenopathy)
•malignant melanoma (metastatic or primary)
Treatment
•surgery: tonsillectomy is rarely curative
•radiation therapy: 75% control of local disease
•chemotherapy is usually ineffective, but piroxicam, cisplatin, and bleomycin have been used with limited success
Prognosis
•12-month survival rate < 10%
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TONSILLAR TUMORS