Subacute Combined Degeneration of the Cervical Spine Secondary to Inhaled Nitrous-Oxide-Induced Cobalamin Deficiency

Summary: Vitamin B12 deficiency can result from poor intake or malabsorption, with causes such as food-bound cobalamin malabsorption and autoimmune chronic atrophic gastritis. Symptoms can include pancytopenia, paresthesias, and neuropsychiatric abnormalities. Rare manifestations like hemolytic anemia may require prompt recognition and treatment.