Periventricular Nodular Heterotopia

**Definition:** A disorder resulting from a defect in the pattern of neuronal migration in which ectopic collections of neurons lie along the lateral ventricles of the brain or just beneath, contiguously or in isolated patches.

**Tree numbers:** - C10.500.507.450.750 - C16.131.666.507.450.750

**Synonyms:** - Periventricular Heterotopia