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    Halo-like phenomenon in a patient with neurofibromatosis type 1 and mongolian spot

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    Neurofibromatosis type 1 (NF1), or von Recklinghausen’s disease, is an autosomal dominant condition with an incidence of 1:3000 and a prevalence of 1:4000 to 1:5000. It is caused by mutations in the NF1 tumor suppressor gene, located on chromosome 17 (17q11.2), which encodes neurofibromin, a protein able to down regulate the Ras-Raf/MAPK signaling pathway that activates cell proliferatio
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