<prompt> Clinical features of Conus Medullaris syndrome include all of the following, except:Plantar extensorAbsent knee and ankle jerksSacral anesthesiaLower sacral and coccygeal involvement  <response>: In conus medullaris syndrome knee jerks are preserved while the ankle jerks are affected. It is an impoant feature differentiating it with cauda equina syndrome. Ref: Harrisons Principles of Internal Medicine, 16th Edition, Pages 2439-40; Neurology Oral Boards Review: A Concise and Systematic Approach to Clinical Practice By Eroboghene E. Ubogu, Page 46 