We report a case with an inlet at L4-L5 and a final migration at S1. We will discuss the different types of migration mechanism as well as the therapeutic choice. ObservationTrader of 28 years, received January 21 st , 2016 for low back pain and desire to remove a projectile at the level of the spine. The current symptomatology dates back to three months and would have started in Libya. Indeed, it would be during his sleep in his room that he would have received a bullet lost by firearm. Initial management would have been done in Libya by local care until healing but without any gesture of ablation of the projectile (Figure 1).The suites of care were simple with a healing of the front door on the 21 st day. This was accompanied by a persistence of sphincter disorders, which resulted in loss of urine staining the underwear (more than five times a day), loss of stool (about ten times a day) and morning erectile dysfunction. The rectal examination found a tonic sphincter with traces of stool to the fingers.On the motor plane, there was a walking with a limp right to the right.The loco-regional examination found a scar of the orifice in projection of the fourth and fifth lumbar vertebra. During this period there was no lumbar arch (Figure 2).