Implantable endoluminal prosthesis suitable for deployment from the aortic annulus to the aorta comprising: 1) a self-expandable braided framework 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 (Ø 25) and having a proximal end configured to extend toward the heart and a distal end configured to extent toward away from the heart and extending along an axis, the self-expandable braided framework comprising: a) at the distal end of the self-expandable braided framework, a main tubular body comprising a lumen in a cylindrical form with a circular cross-section and a constant diameter; b) at the proximal end of the self-expandable braided framework, 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 a thickness ( T 20), 2) a radially collapsible valve body comprising an impermeable material placed within the lumen of the neck, characterized in that, in the fully 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 a plurality of layers (22, 23, 24) of wires made of biocompatible material, each layer forming a mesh, the meshes forming a lattice with a plurality of wires of given layers (22, 23, 24), the lattice, when observed normal to a wall of the self-expandable braided framework, defining polygonal opening units, a ratio ( T 20 /Ø 25) of the thickness ( T 20) of a wall of the self-expandable braided framework to the diameter ( Ø 25) of wire being higher than 2.0. 1) a self-expandable braided framework 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 (Ø 25) and having a proximal end configured to extend toward the heart and a distal end configured to extent toward away from the heart and extending along an axis, the self-expandable braided framework comprising: a) at the distal end of the self-expandable braided framework, a main tubular body comprising a lumen in a cylindrical form with a circular cross-section and a constant diameter; b) at the proximal end of the self-expandable braided framework, 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 a thickness ( T 20), a) at the distal end of the self-expandable braided framework, a main tubular body comprising a lumen in a cylindrical form with a circular cross-section and a constant diameter; b) at the proximal end of the self-expandable braided framework, 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, 2) a radially collapsible valve body comprising an impermeable material placed within the lumen of the neck,