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Reversal of isolated 20q deletion with vitamin B12 replacement in a patient with pernicious anaemia

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By Prakash Peddi, Shashank Reddy Cingam, Nebu Koshy, Diana Veillon
| bmj.com
Severe vitamin B deficiency is well known to cause morphological alterations in bone marrow. In rare instances, these myelodysplastic and megaloblastic changes can coexist with cytogenetic abnormalities. Here, we report a case of a 38-year-old African-American woman with pernicious anaemia, who was found to have an isolated 20q deletion and which resolved after vitamin B replacement. We also discuss various mechanisms in which vitamin B deficiency can lead to chromosomal abnormalities.
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