What is Frontotemporal Degeneration

Frontotemporal degeneration (FTD) is a group of progressive brain disorders caused by the degeneration of the frontal and temporal lobes of the brain, leading to significant changes in behavior, personality, and language. Unlike Alzheimer’s disease, which primarily affects memory early on, FTD typically presents first with challenges in social conduct, executive function, or speech.

What are the primary subtypes of Frontotemporal Degeneration?

Frontotemporal degeneration is classified based on the clinical symptoms and the underlying protein pathology. The main clinical categories include:

• Behavioral Variant FTD (bvFTD): Characterized by prominent changes in personality, social judgment, and empathy.


• Primary Progressive Aphasia (PPA): Involves a gradual decline in language skills, including speaking, writing, and understanding.


• FTD-related Motor Disorders: Certain subtypes, such as Corticobasal Syndrome (CBS) or Progressive Supranuclear Palsy (PSP), combine cognitive decline with movement difficulties.

How common is Frontotemporal Degeneration?

Frontotemporal degeneration is considered a rare cause of dementia, though it is the most common form of dementia in individuals under the age of 65. Estimates suggest a prevalence of approximately 15 to 22 per 100,000 people. While the exact cause is often unknown, approximately 30–50% of cases are thought to have a genetic component, meaning they are inherited through family lines.

What happens in the brain during Frontotemporal Degeneration?

The pathophysiology of frontotemporal degeneration involves the abnormal accumulation of proteins, such as Tau or TDP-43, within brain cells. These misfolded proteins cause neurons in the frontal and temporal lobes to shrink and eventually die. As these specific regions of the brain—which control impulse control, decision-making, and language—atrophy, the patient experiences the progressive symptoms characteristic of frontotemporal degeneration. At DiseaseMaps.org, we currently support 4 members living with this condition, helping them navigate these complex brain changes.

How does it differ from other dementias?

The key differentiator of frontotemporal degeneration is the age of onset, which typically occurs between 45 and 65 years. Unlike typical age-related memory loss, the early stages of frontotemporal degeneration are often marked by a lack of insight into one’s own changing behavior, which can be distressing for families and caregivers.

Next steps

• Consult a neurologist or a behavioral neurologist specializing in neurodegenerative conditions.


• Request a comprehensive neuropsychological evaluation to assess cognitive and language functioning.


• Connect with the 4 community members at DiseaseMaps.org to share experiences and coping strategies.


• Reach out to the Association for Frontotemporal Degeneration (AFTD) for caregiver resources and clinical trial information.

Medical disclaimer: This information is for educational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Frontotemporal Dementia


• Orphanet: Frontotemporal dementia


• The Association for Frontotemporal Degeneration (AFTD)


• OMIM (Online Mendelian Inheritance in Man): Frontotemporal Dementia database