Inverted papilloma of urinary tract

Inverted Urothelial Papilloma: A Lesion with Malignant Potential

“…However, very rare localizations have been reported in the renal pelvis [10][11][12][13], ureteropelvic junction [14,15] and prostatic urethra [16,17]. The ureteral localization has been described in no more than 10 cases in the literature [8,[18][19][20][21][22][23][24], Overall, the localization of inverted papillo mas is analogous to that of exophytic lesions [3].…”

“…The bladder -especially in the trigone and the neck regions -is the portion of the urinary apparatus most frequently involved by inverted papillomas (90% of cases) [4,9,10]. However, very rare localizations have been reported in the renal pelvis [10][11][12][13], ureteropelvic junction [14,15] and prostatic urethra [16,17].…”

Inverted Papilloma of Upper Urinary Tract Four Case Reports

“…This is justified by the fact that the flattened and laminated outer urothelium invagi nâtes deeply into the bladder wall forming pseudopapillary lobules. All the authors who subsequently studied this very curious lesion confirmed these histological features [7,17,18,23,28] without being able to describe their mode of formation in a precise manner. Inverted papilloma of the bladder could develop from Home's subtrigonal glands or Alberran's subcervical glands and, according to other authors, from Von Brunn's nests.…”

Inverted Papilloma of the Upper Urinary Tract

“…By far most of these have been located in the bladder, and only 11 in the upper urinary tract, e g. 7 to the ureter [1,5,7,8,13] and 4 to the renal pelvis [2,11,14,16].…”