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| Causes | Incidence | |
| Iatrogenic | Transurethral prostate resection | 45% |
| Radical prostatectomy | ||
| Hypospadias correction | ||
| Indwelling cather | ||
| Cystoscopy | ||
| Bacterial urethritis | 20% | |
| Lichen sclerosus et atrophicus | 5% | |
| Idiopathic | 30% | |
