Canine Bladder Tumor Study Guide

Overview and Clinical Importance

Transitional cell carcinoma (TCC), also known as urothelial carcinoma (UC), is the most common malignant tumor of the canine urinary tract, accounting for approximately 1.5-2% of all canine cancers. This aggressive neoplasm arises from the transitional epithelium lining the urinary bladder and frequently involves the trigone region, making complete surgical excision challenging.

TCC in dogs is considered a highly relevant comparative model for human invasive bladder cancer, sharing similar molecular features. The disease typically presents with clinical signs mimicking urinary tract infection, often leading to delayed diagnosis.

Etiology and Risk Factors

Breed Predisposition

Certain breeds demonstrate significantly increased risk. The Scottish Terrier has the highest breed-associated risk, approximately 18-20 times greater than mixed breed dogs.