Spinal disc herniation

A 42-year-old man presents to the emergency department as a level 1 trauma following a fall from scaffolding. The patient worked as a painter and slipped and fell approximately 20 ft, landing on his back. Upon arrival, the patient has a GCS of 15 and endorses pain in his lower back. Temperature is 37.0 °C (98.6 °F), pulse is 105/min, respirations are 18/min, blood pressure is 176/65 mmHg, and O2 saturation is 97% on room air. The patient's primary survey is intact, and his secondary survey is notable for a step-off and pain at the T12-L1 spinal level. An emergent MRI of the spine is demonstrated below. Which of the following additional clinical features is most specific to this patient's clinical condition?

Reproduced from: Radiopaedia