The septum pellucidum (translucent hedge) is a thin, triangular, vertical double membrane separating the anterior horns of the left and right lateral ventricles of the brain. It runs as a sheet from the corpus callosum down to the fornix.Absence of the septum pellucidum alone is not a disorder but is instead a characteristic noted in children with septo-optic dysplasia.
Children who suffer from the absence of this membrane and also have other abnormalities like pituitary deficiencies and abnormal development of optic disk have a disorder known as septo-optic dysplasia.
As mentioned, the absence of septum pellucidum alone does not qualify as a disorder. However, when it becomes a part of septo-optic dysplasia the prognosis may vary according to the presence and severity of associated symptoms.
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