The invention is directed to an intracorporeal marker, a delivery device and assembly for such marker and the method of delivering one or more of the markers to an intracorporeal location within a patient. The marker is a body formed at least in part of a bioabsorbable fibrous material such as a fibrous mat or fabric. The delivery devices preferably also include one or more bioabsorbable short term markers which are configured to expand within the body cavity due to contacting a body fluid. The fibrous marker has a radiographically detectable member which preferably hold a portion of the fibrous body in a compressed condition. Preferably, the fibrous marker has a fibrous felt core formed of bioabsorbable material with a fabric jacket formed of bioabsorbable material. Therapeutic, diagnostic and binding agents may be incorporated into the fibrous body of the marker.
