A 48-year-old woman has a lower back pain and hypoesthesia in the left S1 dermatomal distribution (left calf and lateral left foot). What is the most likely cause?
A lesion at the right L4-L5 interspace Pathology where the nerve exits the spinal canal immediately above the pedicle of S3 veebra A herniated nucleus pulposus Compression by the L5 lamina