Behçet disease (BD) is rarely seen in children. Its clinical manifestations are believed to differ between pediatric and adult patients. The characteristics of BD complicated by myelodysplastic syndrome (MDS) are well established for adult patients; however, because only a few cases of pediatric-onset BD complicated by MDS have been reported, its clinical characteristics remain unknown. We here retrospectively review pediatric-onset BD complicated by myeloid malignancies in Japan, having identified five such patients. All patients were female and had gastrointestinal involvements, but lacked both major features of BD, i.e., uveitis and association with HLA-B51. All patients had advanced MDS or acute myeloid leukemia and received chemotherapy followed by hematopoietic stem cell transplantation. These five cases suggest that intestinal BD and myeloid malignancies have one or more pathophysiological mechanisms in common.
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