INverted papilloma of bladder

Inverted Papilloma of the Renal Pelvis

“…Occur rence in association with carcinoma in situ and/or tran sitional cell carcinoma of the bladder is described [3,15,[20][21][22][23]; however, local recurrence is unusual [13,20,23],…”

The Inverted Urothelial Papilloma

“…The inverted papilloma arises according to one theory from irritated bladder mucosa because of its frequent association with proliferative cystitis [7]. Another theory proposes downward proliferation of transitional epithe lium due to chronic inflammation as the cause of the lesion [9], Others have suggested that the inverted papil loma be regarded as a rare variant of the conventional papilloma [10], Occurrence of inverted papilloma some times in association with carcinoma in situ [11] and/or transitional cell carcinoma of the bladder [ 12] obliges one always to take random biopsies.…”

Inverted Papilloma of Ureter

“…More than 100 cases have been reported, mostly occurring in the bladder [5,14,17], Inverted papilloma of the upper urinary tract is even more unusual. There have been 5 reported cases occurring in the renal pelvis [2,11,12,16,17]. Of these, an inverted papilloma with malignant changes has been reported by Uyama and Moriwaki [16].…”