Myelodysplastic syndrome associated with monosomy 7 in a child with Bloom syndrome.

Bloom syndrome is a genomic instability syndrome associated with predisposition to development of various types of malignancy. In this report, we described a 7-year-old boy with Bloom syndrome (BS) and myelodysplastic syndrome (MDS) associated with monosomy 7 and loss of the Y chromosome. To our knowledge, this was the first case with BS showing monosomy 7 and MDS during the early childhood period.