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?

The correct answer to the question "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?" is Option B: High-dose intravenous corticosteroids followed by urgent MRI of the spine..

The other options — A) Lumbar puncture to rule out infectious myelitis., C) Electromyography and nerve conduction studies., D) Urgent surgical consultation for decompressive laminectomy. — are incorrect for this USMLE Exam Prep question. As explained above: 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…