A patient with vitamin B12, deficiency without anemia developed early neurologic manifestations of pernicious anemia, including a previously unreported complication of paroxysmal positional vertigo. All complications promptly disappeared with cyanocobalamin therapy.
Mahmud K, Ripley D, Doscherholmen A. Paroxysmal Positional Vertigo in Vitamin B12 Deficiency. Arch Otolaryngol. 1970;92(3):278–280. doi:10.1001/archotol.1970.04310030068014
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