title: Unusual presentation of vitamin B12 deficiency.
abstract: Cobalamin (vitamin B12) deficiency could be masked by lack of hematological abnormalities or by concomitant conditions associated with microcytosis such as iron deficiency and thalassemia traits. We examined blood and bone marrow morphology, serum ferritin and vitamin B12 levels and fasting gastric pH in nine patients who were suspected to have vitamin B12 deficiency with unusual manifestations. Two patients had neurological symptoms without any hematological abnormalities, two had thalassemia traits, and five had achlorhydria with severe iron and B12 deficiencies. Serum B12 was low in all cases, bone marrow was diagnostic in seven cases and peripheral blood showed hypersegmentation of neutrophils only in five cases. We conclude that vitamin B12 deficiency could be masked by lack of hematological changes or by concomitant causes of microcytosis and that serum vitamin B12 levels as well as other ancillary tests should be considered in all suspected cases.
authors.affiliation: Department of Medicine, King Khalid University Hospital, Riyadh, Saudi Arabia.
authors.forename: A K
authors.initials: AK
authors.lastname: Al-Momen