Orphanet_97685 (17q11 microdeletion syndrome) is a rare severe form of Neurofibromatosis type 1 (NF1; see this term) characterized by mild facial dysmorphism, developmental delay, intellectual disability, increased risk of malignancies and a large number of neurofibromas. Also known as: Del(17)(q11), Monosomy 17q11, NF1 microdeletion syndrome, Neurofibromatosis type 1 microdeletion syndrome.