Vitamin E Deficiency
Neurology
Illness script · Neurology
Vitamin E Deficiency
Fat-soluble antioxidant deficiency causing progressive spinocerebellar ataxia and peripheral neuropathy, most often from fat malabsorption.
This illness script for Vitamin E Deficiency covers predisposing factors, classic presentation, mechanism, workup, management, and the clinical pivots that separate it from look-alikes—written for USMLE Step 1 and clerkship reasoning.
01
Predisposing factors
- Fat malabsorption: Crohn's disease, cystic fibrosis, cholestatic liver disease, short bowel syndrome
- Abetalipoproteinemia (classic board cause — requires lipoproteins for Vit E transport)
- Premature/low-birth-weight neonates (limited stores at birth)
- Familial isolated vitamin E deficiency (FIVE): rare AR mutation in α-TTP gene
- Prolonged parenteral nutrition without supplementation
02
Presentation
- Spinocerebellar ataxia: hallmark — wide-based gait, dysmetria, intention tremor
- Peripheral neuropathy: loss of vibration sense and proprioception (posterior column pattern)
- Areflexia: loss of deep tendon reflexes, especially ankle jerks
- Pigmentary retinopathy → visual field loss in chronic cases
- Skeletal myopathy: proximal muscle weakness
- Hemolytic anemia in neonates: oxidative RBC membrane damage
03
Pathophysiology
- α-Tocopherol is the primary lipid-soluble membrane antioxidant — scavenges free radicals
- Absorbed with dietary fat via chylomicrons; requires bile salts and intact enterocytes
- Deficiency → unchecked oxidative damage to neuronal membranes and myelin
- Demyelination preferentially affects posterior columns, spinocerebellar tracts, peripheral nerves
04
Diagnostics
- Serum α-tocopherol level (low) — interpret relative to total serum lipids for accuracy
- Peripheral blood smear: acanthocytes if underlying abetalipoproteinemia
- CBC: normocytic hemolytic anemia, especially in neonates
- EMG/NCS: axonal sensory neuropathy pattern
- Fat malabsorption workup (fecal fat, lipid panel, serum lipoproteins) to find cause
05
Management
- Oral α-tocopherol supplementation (high-dose if malabsorption is cause)
- Use water-soluble vitamin E (tocopherol polyethylene glycol succinate) when fat malabsorption is severe
- Treat underlying cause (e.g., CF enzyme replacement, cholestasis management)
- Neurological deficits may partially reverse if treated early — advanced deficits can be permanent
- Premature neonates: prophylactic Vit E supplementation to prevent hemolytic anemia and retinopathy
06
Clinical pivots
How to separate this script from the look-alikes that show up on exams and on the wards.
Friedreich's ataxia
Also spinocerebellar ataxia + areflexia, but caused by frataxin gene mutation, associated with hypertrophic cardiomyopathy and pes cavus, and does NOT respond to Vit E replacement.
Vitamin B12 deficiency
Both cause posterior column and peripheral neuropathy, but B12 deficiency also causes UMN signs (subacute combined degeneration) and megaloblastic anemia — B12 level distinguishes.
Abetalipoproteinemia
A cause of Vit E deficiency (not a differential) — flagged by acanthocytosis, near-absent serum cholesterol/LDL, and fat malabsorption from infancy.
Multiple sclerosis
MS causes demyelinating ataxia and sensory loss but shows periventricular T2 lesions on MRI, relapsing-remitting course, and no fat malabsorption history.
Keep reading
Full libraryEducational use only. This illness script is a study framework, not medical advice. Confirm decisions with current guidelines and your clinical supervisors.