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Septo-optic Dysplasia
Background
Septo-optic dysplasia (SOD) is the commonest of the midline cerebral/cranial abnormalities involving the spectrum of holoprosencephaly, absence of the corpus callosum (see entry Agenesis of the Corpus Callosum) and midline cleft palate (see entry Cleft Lip and/or Palate) and also involving the hypothalamopituitary region.
It comprises two out of the three features of optic nerve hypoplasia unilateral or bilateral, absence of the septum pellucidum and pituitary dysfunction. Because 50 per cent of patients with this condition have a septum pellucidum present, the older name of De Morsier's syndrome may be preferable.
