Tumors and Tumor-Like Conditions of Urinary Bladder, Renal Pelvis, Ureter and Urethra

Squamous papilloma of the renal pelvis mimicking transitional cell carcinoma

“…The surface of the tumor is covered with transitional or squamous epithelium. [1,2] Squamous papilloma is a squamous counterpart of urothelial papilloma. They can be seen at any age, but most commonly seen in elderly women.…”

“…They can be seen at any age, but most commonly seen in elderly women. [2] Squamous papilloma of bladder and ureter has been reported, but the involvement of renal pelvis hasn't been reported in the literature till date.…”

“…Squamous papilloma does not show cellular atypia or any evidence of stromal invasion. [2] Squamous papilloma of renal pelvis is always benign while transitional cell papilloma of renal pelvis is more malignant than their corresponding tumors of the bladder. [4] They can be differentiated from malignant tumors only by histopathology.…”