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Visual evoked potential evidence of albino-like chiasmal misrouting in a patient with Angelman syndrome with no ocular features of albinism

Published online by Cambridge University Press:  01 September 1999

D A Thompson
Affiliation:
Department of Ophthalmology, Great Ormond Street Hospital for Children NHS Trust, London, UK
A Kriss
Affiliation:
Department of Ophthalmology, Great Ormond Street Hospital for Children NHS Trust, London, UK
S Cottrell
Affiliation:
Department of Clinical Molecular Genetics, Great Ormond Street Hospital for Children NHS Trust, London, UK
D Taylor
Affiliation:
Department of Ophthalmology, Great Ormond Street Hospital for Children NHS Trust, London, UK
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Abstract

An 8-month-old boy with global developmental delay, including visual and hearing inattention, was examined in the ophthalmic clinic. Monocular flash visual evoked potentials demonstrated a crossed asymmetry in scalp distribution, a feature considered to be pathognomic of albinism. Remarkably a foveal reflex was noted in each eye and this patient did not have nystagmus, iris transillumination, nor conspicuously pale fundi. The optic discs appeared normal. He was noted to have very fair skin and hair, with a small head and flat occiput. Cytogenetic studies demonstrated a microdeletion of the maternal chromosome 15q11–q13, and he was diagnosed with Angelman syndrome.

Type
Case Reports
Copyright
© 1999 Mac Keith Press

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