Q. A 40 year-old female presents to the emergency room due to acute onset of left leg weakness. She notes that her foot drags when she is walking. She also endorses shooting pain from the buttock down the posterior aspect of her leg. She denies recent spine trauma, bowel, or urinary incontinence. She denies symptoms in her right leg or upper extremities. Her vitals are as follows: blood pressure 145/85 mmHg, heart rate 75, temperature 37.5°C, respiratory rate 10, oxygen saturation 96% on room air. Her neurology exam shows weakness in left ankle dorsiflexion, foot eversion, and toe extension. Patellar and achilles reflexes are normal. Pinprick and vibration are reduced in the left foot. Left straight leg test is positive. The remainder of her neurological exam is unremarkable. What location is most likely to be affected in this patient?