Between April 1986 and February 1988, 72 endoprosthesis implantations were carried out in the coronary arteries of 65 patients. The indication for implantation was either abrupt closure post angioplasty or prevention of restenosis. The first 3 cases of restenosis within the stented segment are reported. Two were treated by repeat balloon angioplasty, with temporary improvement. The possible mechanisms underlying this particular form of restenosis are discussed.