Herniated nucleus pulposus, or herniated disk, is prolapse of an intervertebral disk through a tear in the surrounding annulus fibrosis. Symptoms of a herniated disk may mimic symptoms of an epidural abscess; therefore, distinguishing between these two conditions is part of the initial history and physical examination. During the examination, which of the following findings is most likely in a patient with an epidural abscess rather than a lumbosacral herniation?