<prompt> Which of the following is the most common feature of Aoitis on chest X-ray -Calcification of ascending aoaCalcification of descending aoaCalcification of pulmonary aeryFocal oligemia  <response>: Saccular aneurysm with pencil-thin dystrophic calcification most commonly in ascending aoa commencing near aoic root is characteristic of syphilitc aoitis. Aoic aneurysm in Marfans syndrome often involves sinuses of valsalva and ascending aoa.It can also effect aoic ring resulting in AR. Takayasu aoitis affects segments of aoa including main aoic branches and pulmonary aeries. Ref : sutton 7ep312-14 