A rare non-syndromic cerebral malformation due to abnormal neuronal migration characterized by clusters of disorganized neurons in abnormal locations such as periventricular and subcortical. The extent of the lesions ranges from isolated single to bilateral confluent nodules. Pediatric patients typically show variable degrees of developmental delay intellectual disability and intractable epilepsy and concomitant cerebral and/or systemic malformations are frequent. Milder forms may present with onset of seizures in adulthood.
Data from Orphanet are used to provide information on a disease's name, synonym(s), and overview. Reference: Access aggregated data from Orphanet at Orphadata. Orphadata: Free access data from Orphanet. © INSERM 1999. Available on http://www.orphadata.org. Data version August 2026
Newly diagnosed with
Nodular neuronal heterotopia?
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Advocacy Organizations
Access to Life NGO
Access to Life is Ukraine’s first patient advocacy organization for rare genetic epilepsies, anchored in Dravet syndrome and SCN1A-related conditions. We support 600+ families nationwide, advocate for a national clinical protocol and drug access, and are building Ukraine’s National Patient Resource Centre and Patient Registry for genetic epilepsies.
Genetic Epilepsy Team Australia
Collaboration of research and care
Legacy Bridges Foundation, Inc
The Legacy Bridges Foundation, Inc. is a 501(c)3 non-profit organization founded to bridge the gap to support, educate and advocate for individuals, families and caregivers of those living with epilepsy and other seizure related disorders. The Legacy Bridges Foundation, Inc. is dedicated to helping champions live a sustainable life through participation of essential supportive programs and service
PPP2CA Pathways
PPP2CA Pathways connects families, shares strength, and supports the research community in the search for answers to Houge-Janssens Syndrome type 3.
PVNH Support & Awareness
PVNH Support & Awareness connects families together, advocates and educates patients, family members and medical professionals about Periventricular Nodular Heterotopia and other forms of neuronal heterotopia disorders. Our mission is to positively impact the outcome of affected patients’ lives.
Rare Epilepsy Network (REN)
Improving outcomes of people with rare epilepsies through an innovative collaborative infrastructure that drives urgent, patient-centered research, educaiton and advocacy.
ReNU2 Foundation
ReNU2 Foundation supports families affected by RNU2-2-related neurodevelopmental disease. We foster collaboration, raise awareness, and advance research—pursuing a world where every family has testing, informed care, community, and treatment.
Uganda Alliance of Patients Organization
Supporting patients to access quality, safe and patient-centered healthcare services.
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Clinical Trials
For a list of clinical trials in this disease area, please click here.