International audience; Pelvic surgery raises the challenge of preser-vation of nerves that handle urinary, gen-ital and digestive functions, especially insituations where these structures may be modi-fied by tumors or malformations. Recent workson 3D nerve visualization, that rely on cadaversdissections [1, 3] or intra-operative use of probesdetecting myelin-binding fluorophores [5], donot provide pre- or post-operative analysis ofthe pelvic nervous anatomy. Magnetic reso-nance neurography as in [12] requires a slice byslice manual segmentation of the nerves. Dif-fusion MRI, associated with tractography algo-rithms, is currently the only technique allow-ing for in-vivo exploration of the nervous net-work [2] with no need for manual nerve segmen-tation. In contrast to brain imaging that moti-vated a lot of work, only few studies focus on pe-ripheral nerves visualization [9, 10, 14]. In thispaper, we propose a method for pelvic tractog-raphy analysis based on patient-specific organsegmentation. It is demonstrated with promis-ing results on a healthy adult subject.