The invention provides expandable tubular endoluminal prostheses for the treatment of atherosclerotic lesions, such as vulnerable plaques, and methods for treating such lesions using the prostheses. The endoprostheses may include at least two expandable ring-like elements disposed on the inside or about the outer surface of an at least substantially tubular biodegradable element. The ring-like elements may be radio-opaque and may have a sinuate form. In use, a prosthesis according to the invention is expanded in a blood vessel so that the tubular biodegradable element at least partially covers an atherosclerotic lesion, such as a vulnerable plaque.