A urothelial papilloma is a rare, noncancerous tumor found within the urinary tract.
The most common presenting symptom is hematuria (blood in urine). The average age at which it occurs is 46 years old.
The tumor is made of a fibrovascular core covered by seemingly normal urothelium tissue. Under microscope, papillary (finger-like) fronds can be seen that feature occasional branching, but no fusion.
The tumors are diploid (contain two sets of chromosomes). They commonly show FGFR3 mutations. [1]
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