Soru

Emergency medical responders bring a 55-year-old woman to the emergency department due to bilateral lower extremity weakness that began 48 hours ago. She reports a four-week history of relentless, deep mid-back pain that frequently awakens her from sleep and is refractory to over-the-counter analgesics. Her past medical history is significant for estrogen-receptor-positive breast cancer, for which she completed adjuvant endocrine therapy one year ago. On physical examination, her temperature is 37.2°C (99.0°F), blood pressure is 135/85 mm Hg, and pulse is 92/min. There is focal tenderness to percussion over the T9 and T10 spinous processes. Neurological evaluation reveals 3/5 motor strength in the bilateral hip flexors, knee extensors, and ankle dorsiflexors. Deep tendon reflexes are 3+ at the patellae and Achilles bilaterally. Upgoing plantar reflexes (positive Babinski sign) are noted bilaterally. Pinprick sensation is markedly diminished below the level of the umbilicus. Rectal examination demonstrates decreased anal sphincter tone.

Based on the clinical presentation, arrange the following differential diagnoses from most likely (top) to least likely (bottom).