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Living with Familial encephalopathy with neuroserpin inclusion bodies

A rare inherited brain condition with memory and thinking decline and seizures that are hard to control.

Understanding Familial encephalopathy with neuroserpin inclusion bodies

Familial encephalopathy with neuroserpin inclusion bodies (FENIB) is a disorder that causes brain function to decline over time.

It causes loss of thinking skills (dementia) and seizures. Early signs may be problems with attention and concentration, followed by personality changes and memory trouble. People often need full-time care over time. Many have muscle-jerk seizures (myoclonus) that do not respond well to seizure medicine. Signs can appear at any age, from childhood to adulthood.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Dementia (loss of thinking skills)
  • Seizures
  • Muscle jerks (myoclonus)
  • Slurred speech (dysarthria)
  • Involuntary movements
  • Shrinking of the brain (cerebral atrophy)

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include brain and nervous system specialists, genetic specialists and seizure and epilepsy specialists.

  3. Consider genetic testing

    Changes in SERPINI1 are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

  4. Connect with expert centers

    Epilepsy Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists); Seizure and epilepsy specialists (epileptologist)
Expert care
Expert lists: Epilepsy Foundation
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Epilepsy Foundation
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Can genetic testing for the SERPINI1 gene confirm this diagnosis?
Which seizure treatments might help?
What care and support will we need as symptoms change?

Quick facts

Symptoms usually startfrom Childhood to Adulthood
InheritanceAutosomal Dominant
GenesSERPINI1

Changes in the SERPINI1 gene cause this condition. It is autosomal dominant, which means a change in one copy of the gene can cause it.

GeneticNeurological

Also known as: encephalopathy, familial, with collins bodies; familial dementia with neuroserpin inclusion bodies; fenib

Patient organizations

Broader rare-disease groups

Source: NIH GARD · Familial encephalopathy with neuroserpin inclusion bodiesGARD ID 10037 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

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