Introduction: Today, surgical errors are becoming less and less frequent, thanks to the development of new techniques and the choice of different approaches. Nevertheless, they are still possible, and it is important to mention them in order to prevent them and avoid their recurrence. Case Presentation: We report a case of intravesical textiloma, rarely observed in urological surgery, in an 80-year-old patient who underwent laparoscopic inguinal hernia repair and presented to a urological consultation with hematuria and irritative lower urinary tract signs. Abdominal ultrasound revealed a hyperechoic tissue-like formation in the posterior wall of the bladder. The diagnosis of a bladder tumor was therefore raised, and cystoscopy was performed, which revealed an intravesical textiloma. All foreign bodies were removed endoscopically, and the patient had a good post-operative outcome. Conclusion: The rarity of the urological location of textilomas and the importance of their prevention remain a goal in surgery, whatever the specialty.