Vitamin B12 deficiency can cause serious developmental regression, hypotonia and cerebral atrophy in infants. We report a 6-month-old infant, with insidious developmental regression and brain atrophy showed by CT scan, secondarily to vitamin B12 deficiency. His mother was a strict vegetarian and the patient was exclusively breastfed. The clinical symptoms and the brain CT were normalized after vitamin B12 administration.
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Accepted: February 9, 2005
Received in revised form: February 8, 2005
Received: February 3, 2004
© 2005 Elsevier B.V. Published by Elsevier Inc. All rights reserved.