<prompt> An elderly man presents with ho abdomianl pain. He is found to have a fusiform dilatation of the descending aoa. Likely cause is:TraumaAtherosclerosisRight ventricular failureSyphilitic aoitis  <response>: The is a case, of a symptomatic aneurysm suggested by pain as well as a fusiform dilatation of the aoa. 95 of the abdominal aneurysms are due to atherosclerosis. Ref: Bailey and Loves Sho Practice of Surgery, 25th Edition, Page 918 and 23rd Edition, Page 727. 