Chronic inflammation of the urinary bladder can cause benign exophytic lesions of the urinary bladder at any age.
Risk factors:
(1) indwelling urinary catheter
(2) vesical fistula
(3) other chronic inflammation of the urinary bladder mucosa
On cystoscopy there is cystitis with friable mucosa and exophytic lesions that may be multifocal.
Exophytic Component
Term
slender, finger-like (width less than length)
papillary
thick with broad base (width equals length)
polypoid
width greater than length
bullous
Histologic features:
(1) chronic inflammation
(2) edematous fibrovascular core
(3) nonbranching papillae
(4) variable reactive atypia
Differential diagnosis:
(1) papillary urothelial neoplasm
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Specialty: Nephrology, Clinical Laboratory
