Rehman HU
Vitamin B12 deficiency is common. Pernicious anemia is the most common cause of severe vitamin B12 deficiency worldwide [1]. Clinical spectrum of vitamin B12 deficiency may range from asymptomatic subclinical state to megaloblastic anemia to demyelination of the cervical and thoracic dorsal and lateral columns of the spinal cord and demyelination of the white matter in the brain.
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