Neurodegenerative Diseases USMLE Step 1 Practice Question
A 6-year-old boy is brought to the clinic for evaluation of a small patch of hair over his lower back. Vital signs are normal (BP 110/68, HR 92, RR 20, Temp 98.6°F, SpO2 98%). Neurological examination reveals no motor or sensory deficits. Spinal MRI demonstrates a vertebral arch defect at L5 without herniation of meninges, neural tissue, or tethering. Urinalysis is normal. Which of the following is the most likely diagnosis?
Answer choices
- AMyeloschisis
- BMyelomeningocele
- CAnencephaly
- DSpina bifida occultaCorrect answer
- EMeningocele
- FTethered spinal cord
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