Systemic epidermal nevus with involvement of the oral mucosa due to <it>FGFR3 </it>mutation

• Main Authors: Clemmensen Ole J, Fagerberg Christina R, Bygum Anette, Fiebig Britta, Hafner Christian
• Format: Article
• Language: English
• Published: BMC 2011-06-01
• Series: BMC Medical Genetics
• Online Access: http://www.biomedcentral.com/1471-2350/12/79

<p>Abstract</p> <p>Background</p> <p>Epidermal nevi (EN) represent benign congenital skin lesions following the lines of Blaschko. They result from genetic mosaicism, and activating FGFR3 and PIK3CA mutations have been implicated.</p> <p>Case presentation</p> <p>We report a female patient with a systemic keratinocytic nevus also involving the oral mucosa. Molecular genetic analysis revealed a mosaicism of the <it>FGFR3 </it>hotspot mutation R248C in the EN lesions of the skin and of the oral mucosa. The detection of the R248C mutation in a proportion of blood leukocytes and a slight scoliosis suggest an EN syndrome.</p> <p>Conclusions</p> <p>Our results show that activating <it>FGFR3 </it>mutations can also affect the oral mucosa and that extracutaneous manifestations of EN syndrome can be subtle. We highlight the theoretical risk of the patient having an offspring with thanatophoric dysplasia as gonadal mosaicism for the R248C mutation cannot be excluded.</p>