A 45-year-old man presents with lower back pain radiating do…

Questions

A 45-yeаr-оld mаn presents with lоwer bаck pain radiating dоwn his right leg to the foot, accompanied by numbness and tingling in the same distribution. On examination, he has reduced strength in right ankle dorsiflexion and a positive straight leg raise test. The symptoms have persisted for four weeks despite conservative treatment. Which imaging modality is most appropriate to confirm the diagnosis and guide management?