Expanding the phenotype of a neurofibromatosis type 1-like syndrome: a patient with a SPRED1 mutation and orbital manifestations.
A 4-year-old child with no medical history presented for evaluation of a small, palpable nodule near the left inferolateral rim. The lesion had a bluish hue and had been slowly enlarging over the course of several months. MRI of the orbits revealed a heterogenous and infiltrative preseptal and extraconal mass which enhanced with gadolinium, and sphenoid wing dysplasia on the left. A complete ophthalmic and physical examination failed to reveal any other stigmata of neurofibromatosis type 1 (NF1) or neurofibromatosis type 2 (NF2). An incisional biopsy of the palpable mass revealed a plexiform neurofibroma. Molecular sequencing of the NF1 and NF2 genes did not reveal causative mutations. Further investigation revealed a loss of function mutation in SPRED1 on chromosome 15. Although loss of function mutations in the SPRED1 gene are known to cause several dermatologic changes associated with the NF1-like phenotype, to our knowledge, this is the first description of a SPRED1 gene mutation resulting in ophthalmic abnormalities.
Lane
Katherine A
KA
Children's Hospital of Philadelphia, University of Pennsylvania Hospital System, Philadelphia, Pennsylvania 19104-4399, USA. katelane@verizon.net
Anninger
William V
WV
Katowitz
James A
JA
D048868:Adaptor Proteins, Signal Transducing; D002675:Child, Preschool; D002884:Chromosomes, Human, Pair 15 / Q000235:genetics*; D004252:DNA Mutational Analysis; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins / Q000235:genetics*; D008279:Magnetic Resonance Imaging; D008297:Male; D008565:Membrane Proteins / Q000235:genetics*; D009154:Mutation / Q000235:genetics*; D009456:Neurofibromatosis 1 / Q000175:diagnosis / Q000235:genetics*; D009918:Orbital Neoplasms / Q000175:diagnosis / Q000235:genetics*; D010641:Phenotype; D016133:Polymerase Chain Reaction
D048868:Adaptor Proteins, Signal Transducing; D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins; C504812:SPRED1 protein, human