OVERVIEW
Rapid and progressive local invasion by cords of neoplastic squamous epithelium arising from the tonsillar fossa into tonsillar lymphoid tissue
Local extension common
Quick to metastasize to lymph nodes (> 98%), lungs (> 63%), and other distant organs (>20)
Composes 20%–25% of all oral tumors and 50% of all intraoral tumors in dogs and cats
Commonly unilateral, affecting the right more than the left tonsil
SIGNALMENT
Middle-aged or old (range, 2.5–17 years) dogs and cats
No known breed or sex predilection
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