A notable case to report was of a 40 years of age male patient who initially had normal B12 level, however, he dermonstrated progressive neurological symptoms and repeat MR imaging indicted posterior cervical cord lesion. A secind test of B12 levels indicated a low B12 status of 41 pg/mL. The authors recommend that in cases where B12 is in the low normal range at first test, levels of methylmalonic acid and homocysteine should be checkek to confirm adiagnosis [33]