A fenestrated endoprosthesis for the correction of aortic arch aneurysms comprising: a stent (20) having a first oblong lateral hole (23) having an area equal to the total area occupied by the innominate artery (11) and by the carotid artery (12); said stent (20) comprises a metal skeleton (21) covered with a fabric (22); characterized by comprising a flexible sac (30) that covers said stent (20) covered with fabric (22); said sac (30) comprises a second lateral hole (32) having an area larger than said first hole (23), so that the edges (26) of said stent (20) covered with fabric (22) that delimit said first hole (23) are visible; the edges (33) of said sac (30) that delimit the hole (32) are welded to said stent (20) covered with fabric (22); a volume (31) is created between said stent (20) covered with fabric (22) and said sac (30); said volume (31) is filled with a polymer.L'invention concerne une endoprothèse fenêtrée destinée à la correction d'anévrismes de l'arche aortique comprenant : un stent (20) qui possède un premier trou latéral oblong (23) ayant une surface égale à la surface totale occupée par le tronc artériel brachiocéphalique (11) et par l'artère carotide (12); ledit stent (20) comprenant un squelette métallique (21) recouvert d'un tissu (22); caractérisé en ce qu'il comprend un sac souple (30) qui recouvre ledit stent (20) recouvert de tissu (22); ledit sac (30) comprend un deuxième trou latéral (32) ayant une surface plus grande que ledit premier trou (23), de sorte que les bords (26) dudit stent (20) recouvert de tissu (22) qui délimitent ledit premier trou (23) sont visibles; les bords (33) dudit sac (30) qui délimitent le trou (32) sont soudés audit stent (20) recouvert de tissu (22); un volume (31) est créé entre ledit stent (20) recouvert de tissu (22) et ledit sac (30); ledit volume (31) est rempli d'un polymère.