<prompt> Characterstic CVS leison in syphils is -Aneurysm of arch of aoaAoic ring dilatationMedial necrosisAll  <response>: Ans. is b i.e., Aoic ring dilatation Syphilitic aoitis usually affects the proximal ascending aoa, paicularly the aoic root, resulting in aoic dilatation and aneurism formation. 