Bladder endometriosis: Preoperative MRI analysis with assessment of extension to ureteral orifices

•MRI enables to accurately locate endometriosis implants within the bladder wall.•Low bladder volume impacts distance estimation between endometriosis implants and ureteral orifice.•A bladder volume>150mL seems to allow a more accurate MRI evaluation of bladder endometriosis.•Optimized bladder repletion is critical for the analysis of bladder endometriosis.