Abstract: The invention concerns a marker intended to facilitate the location of a determined area of an internal organ during secondary surgical procedures where an earlier surgical procedure has been performed, whereby the said internal organ can be native just as it can be a synthetic or autonomic implant and/or a combination of such organs and in this part the area of intervention can be the transition of an anastomosis, whereby to facilitate the said location the marker (4) comprises a part (5) designed as an implant for securing to the area of intervention during a primary operation to form a tactile barrier or boundary for the surgeon during the secondary operation between the area of intervention and the surrounding tissue. The invention also concerns an implant such as a graft provided with such a marker.