Source / episode info

• **Episode:**506
• **Title:**Divine Intervention Episode 506: Weird But HY Spinal Cord Disorders (for Step 1-3)
• **Published:**2024-01-24
• Source:Episode page

One-liner

This episode emphasizes recognizing key spinal cord pathways (dorsal columns, corticospinal tract, spinothalamic tract), differentiating demyelinating syndromes (MS vs NMO vs TM), understanding the patterns of spinal cord infarction and nutritional deficiencies (B12/Copper), and mastering the workup and management of spinal cord compression.

High-yield summary

• Spinal Tracts: Dorsal columns carry vibration, fine touch, and proprioception; Corticospinal tract carries UMN signs; Spinothalamic tract carries pain/prick/temperature (loss is contralateral).
• Demyelinating Syndromes: MS presents with separated in space and time deficits, often associated with oligoclonal bands. NMOSD requires anti-NMO antibodies and typically involves optic neuritis. Transverse Myelitis follows a viral illness but lacks the specific serology or episodic nature of MS/NMOSD.
• Spinal Cord Infarction: Typically presents as an anterior spinal artery syndrome (anterior 2/3 involvement), sparing the dorsal columns, often following hypotension or aortic surgery.
• Nutritional Deficiencies: B12 deficiency causes subacute combined degeneration (posterior columns + corticospinal tract) and is associated with elevated MMA and homocysteine. Copper deficiency can be seen after bariatric surgery or zinc excess.
• Spinal Cord Compression Workup: Always start with an MRI. The management depends on the cause: steroids/surgery/radiation for masses; no steroids for infection/hematoma.

Learning objectives

• Identify the major ascending and descending tracts of the spinal cord and their corresponding clinical deficits.
• Differentiate between Multiple Sclerosis, Neuromyelitis Optica Spectrum Disorder, and Transverse Myelitis based on clinical course, serology, and imaging findings.
• Recognize the classic signs and risk factors associated with anterior spinal artery syndrome/spinal cord infarction.
• Correlate specific neurological deficits (e.g., macrocytic anemia, elevated MMA) with Vitamin B12 deficiency or Copper deficiency.
• Apply systematic approaches to diagnosing spinal cord compression based on clinical history (trauma, cancer, infection).

Board exam buzzwords