I cannot give you a clinical diagnosis over the internet as this site is purely educational
Cauda equina syndrome is very rare, and is seen usually in the setting of a tumor or cancer. MRI is usually suffiecient to show whether there is spinal cord compression or not, as long as all the appropriate areas of the spine are visualized. Contrast may be helpful if deciding what is the cause of a mass if one is present, but is usually not done or required for routine rulout spinal cord compression studies.
Your symptoms could be consistent with a history of spinal cord injury - I cannot comment more specifically as I have no details of the severity of the injury. Various test such as needle EMG of the anal sphincter, urine flow tests, tests of erectile function, can measur ethe degree of injury and sometimes help localized the level of the injury along with the neurological examination.