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Neurofibromatosis type I (NF1) microdeletion syndrome, which is present in 4–11% of NF1 patients, is associated with a severe phenotype as it is caused by the deletion of NF1 and other genes in the 17q11.2 region. The variable expressivity of the disease makes it challenging to establish genotype–phenotype correlations, which also affects prognosis and counselling. We here describe a 3-year-old NF1...