Microcephaly was present in 100 % of Nijmegen breakage syndrome patients in a recent large international cooperative study .
B-DiseaseOrPhenotypicFeature O O O O O O B-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature B-OrganismTaxon O O O O O O O O