Fibrosis within the urethra secondary to past infection/inflammation, trauma
Also unusual cancers that compress or block urethra (e.g. lymphoma, sarcoma, bladder cancer).
Risk Factors
Male
Hx gonorrhea
Hx pelvic xrt
Hx urethral trauma
Hx prostate surgery
Ucommon in women due to short urethra unless hx urethritis, discrete trauma; Also from unusual cancers causing urethral compression or internal blockage