URETERAL DIVERTICULA IN 2 DOGS

We describe ureteral diverticula in two dogs and briefly review the re lated literature. The diagnosis of this condition is radiographic and based on the excretory urographic observation of multiple ureteral out pouchings. Pathologically, ureteral transitional cell hyperplasia and mucinous metaplasia result in submucosal proliferation of the urotheli um and the formation of crypts and small cysts. Ureteral diverticulosi s in humans is associated with an increased risk of urothelial maligna ncies, such as transitional cell carcinoma of the urinary bladder. Cli nically, both dogs were older, small breed neutered females. Both had a history of chronic urinary obstruction. One dog died during surgery to remove an adrenal mass, and the other was euthanized at the owner's request because of an inoperable bladder neoplasm. Histopathologic di agnosis of ureteral lesions confirmed the radiographic diagnosis of ur eteral diverticula in both dogs.