Urinary Tract Villous Adenoma
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Benign exophytic glandular tumor.
It is a rare tumor which arises from a metaplastic process of the urothelium.
It occurs mainly in elderly patients: mean age 65 years, range 23–94.
There is reported a male predominance.
The urachus and the bladder dome and the trigone are the most common site.
The treatment is surgical excision of the tumor.
Prognosis is excellent; however the progression to adenocarcinoma has been reported in 20% of the cases when the lesion has not been completely resected.
Grossly, it appears as an exophytic lesion.