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hardpathophysiology
An elderly patient with a history of gastric bypass surgery complains of fatigue, a sore tongue (glossitis), and tingling in his hands and feet (paresthesias). Labs: Hgb 9.5 g/dL, Hct 29%, MCV 115 fL (high). The high MCV and neurological symptoms are strongly suggestive of a deficiency in which vitamin?
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