A 62-year-old male with metastatic prostate cancer presents with progressive lower extremity weakness, numbness, and new urinary retention over 24 hours. He denies trauma. What is the most critical immediate diagnostic and therapeutic intervention?

✓ Correct Answer: Option B

This presentation is classic for malignant spinal cord compression. High-dose corticosteroids should be administered immediately to reduce edema and preserve neurological function, followed by urgent MRI of the spine to localize the lesion and guide further management.