Implantable endoluminal prosthesis suitable for deployment from the aortic annulus to the aorta comprising: 1) a self-expandable braided framework extending along an axis able to expand from a radially compressed state in a delivery configuration to a radially expanded state, the self-expandable braided framework being formed of braided wires having a given diameter (∅ 25) and having a proximal end configured to extend toward the heart, and a distal end configured to extent toward away from the heart, this self-expandable braided framework comprising: a) toward the distal end, a main tubular body comprising a lumen in a cylindrical form with a circular cross-section and a constant diameter; b) toward the proximal end, a neck comprising a lumen in a cylindrical form with a circular cross-section and a constant diameter smaller than the one of said main tubular body; and c) a transition portion extending between the proximal end of the main tubular body and the distal end of the neck, said main tubular body, said neck and said transition portion consisting of an integrated structure being devoid of any impermeable cover layer, and forming a wall having an average thickness ( T 20), 2) a radially collapsible valve body comprising an impermeable material placed within the lumen of the neck, characterized in that, in radially expanded state, the total length of the main tubular body and the transition portion is at least 50 mm, the self-expandable braided framework comprising plurality of wires made of biocompatible material and forming a lattice when observed normal to a wall of the self-expandable braided framework, the lattice defining polygonal opening units, a ratio ( T 20 /∅ 25) of the average thickness ( T 20) of a wall of the self-expandable braided framework to the diameter (∅ 25) of wire being greater than 2.0, the self-expandable braided framework comprising less than 150 wires, preferably at least 90 wires and at most 130 wires. 1) a self-expandable braided framework extending along an axis able to expand from a radially compressed state in a delivery configuration to a radially expanded state, the self-expandable braided framework being formed of braided wires having a given diameter (∅ 25) and having a proximal end configured to extend toward the heart, and a distal end configured to extent toward away from the heart, this self-expandable braided framework comprising: a) toward the distal end, a main tubular body comprising a lumen in a cylindrical form with a circular cross-section and a constant diameter; b) toward the proximal end, a neck comprising a lumen in a cylindrical form with a circular cross-section and a constant diameter smaller than the one of said main tubular body; and c) a transition portion extending between the proximal end of the main tubular body and the distal end of the neck, said main tubular body, said neck and said transition portion consisting of an integrated structure being devoid of any impermeable cover layer, and forming a wall having an average thickness ( T 20), a) toward the distal end, a main tubular body comprising a lumen in a cylindrical form with a circular cross-section and a constant diameter; b) toward the proximal end, a neck comprising a lumen in a cylindrical form with a circular cross-section and a constant diameter smaller than the one of said main tubular body; and c) a transition portion extending between the proximal end of the main tubular body and the distal end of the neck, said main tubular body, said neck and said transition portion consisting of an integrated structure being devoid of any impermeable cover layer, and forming a wall having an average thickness ( T 20), 2) a radially collapsible valve body comprising an impermeable material placed within the lumen of the neck, characterized in that, in radially expanded state, the total length of the main tubular body and the transition portion is at least 50 mm, the self-expandable braided framework comprising plurality of wires made of biocompatible material and forming a lattice when observed normal to a wall of the self-expandable braided framework, the lattice defining polygonal opening units, a ratio ( T 20 /∅ 25) of the average thickness ( T 20) of a wall of the self-expandable braided framework to the diameter (∅ 25) of wire being greater than 2.0, the self-expandable braided framework comprising less than 150 wires, preferably at least 90 wires and at most 130 wires.