Skip to content
How It Works
Explore
Ask a Question Resources Pricing
Who It's For
Patients
Decode results, prep for appointments, weigh options.
Caregivers & advocates
Carry the research load for someone you love.
Providers & clinicians
Resources for patients in your practice.
Log In Sign Up
PubMed This is a summary of 18 peer-reviewed journal articles Updated
Neurology · Primary Familial Brain Calcification

Understanding Your Diagnosis: Primary Familial Brain Calcification

At a Glance

Primary familial brain calcification is an inherited condition that causes calcium deposits in the basal ganglia and other brain regions. Scan findings do not reliably predict symptoms, so diagnosis and follow-up focus on clinical health, ruling out secondary causes, and individualized care.

Receiving a diagnosis of Primary Familial Brain Calcification (PFBC) can feel overwhelming, especially because the condition is rare and often misunderstood [1][2]. You may have heard it called Fahr’s Disease, an older name used to describe the buildup of calcium in specific areas of the brain [3][4]. Note that “Fahr’s disease” can sometimes be confusing because the term “Fahr syndrome” is often used for secondary brain calcification. It is important to know that your experience is valid; because this condition is uncommon, many general practitioners may not have encountered it before, making it essential to work with specialists who understand its complexities [5][6].

What is PFBC?

Primary Familial Brain Calcification (also called Primary Brain Calcification, or PBC) is a genetic condition where calcium deposits form in the brain’s basal ganglia (structures that help control movement) and other regions [7][1]. Unlike other types of brain calcification that might be caused by infections or hormone imbalances, PFBC is “primary,” meaning it is typically rooted in your genetic makeup [5][6]. While it was once thought to be exceptionally rare, newer research estimates radiologic calcification may affect between 2 and 6 out of every 1,000 people, though symptomatic, genetically confirmed PFBC is rarer, and many people never develop symptoms [1][8].

The Gap Between Scans and Symptoms

One of the most important things to understand about PFBC is that your brain scan does not tell your whole story. Doctors often talk about two different ways the disease shows up:

  1. Imaging Phenotype: This is what shows up on a CT scan or MRI. In people with specific PFBC genes, the “imaging penetrance” (the likelihood that calcification will show up on a scan) has been estimated in some studies as nearly 100% [7][9].
  2. Clinical Phenotype: This refers to the actual symptoms a person feels, such as movement challenges, mood changes, or memory issues. The “clinical penetrance” (the likelihood of actually feeling sick) is much lower, estimated in a pooled review at about 61% [7][9].

These percentages are research estimates, not predictions of your personal future. Crucially, the volume or amount of calcification seen on your scan does not strictly predict how severe your symptoms will be [7][10]. Some people with extensive calcification remain completely asymptomatic (without symptoms), while others with very small deposits may experience noticeable changes [8][2]. This is why modern guidelines recommend that doctors focus on your clinical well-being rather than just the “spots” on the scan [6][11].

A Highly Variable Journey

PFBC is known for its variable expressivity, which means it can look very different even among members of the same family who have the exact same genetic variant [12][13].

  • Age of Onset: Symptoms can begin at almost any age. In common genetic forms, the median age for symptoms to start is around 31, but it can range from early childhood to late adulthood [14][7].
  • Incomplete Penetrance: As mentioned, nearly one-third of people with the genetic markers for PFBC never develop clinical symptoms [2][9]. Inheriting a variant does not mean you have a 61% personal risk of symptoms.
  • Progression: The disease does not follow a single, predictable path. While calcification may slowly increase over years, your symptoms may stay stable for long periods [11][15].

Why Expertise Matters

Because PFBC is rare, your local doctor may not be familiar with the latest 2025 international consensus guidelines, which propose a framework categorizing the diagnosis as possible, probable, or definite [6]. A specialist, such as a neurogeneticist or a movement disorder specialist, can help confirm that your calcification isn’t caused by a treatable metabolic issue, like a parathyroid disorder, before confirming a PFBC diagnosis [5][16].

Managing PFBC currently focuses on symptom-focused care—treating individual symptoms like headaches, mood changes, or movement issues as they arise—rather than trying to “remove” the calcium [17][18]. Engaging with research registries or specialized clinics can help ensure you are connected to the most current understanding of this unique condition [NCT01793168][NCT05662111]. There is no universally established schedule for imaging asymptomatic relatives, so testing decisions should consider psychosocial and privacy factors.

Common questions in this guide

What is primary familial brain calcification?
Primary familial brain calcification, or PFBC, is an inherited condition in which calcium deposits form in the brain, especially the basal ganglia and sometimes other regions. It is called primary when the calcification is linked to the condition’s genetic basis rather than an infection, hormone problem, or another secondary cause.
Can I have PFBC on a brain scan without having symptoms?
Yes. A CT or MRI may show calcification in people who have no clinical symptoms, and the amount of calcium on a scan does not reliably predict symptom severity. Doctors therefore consider movement, mood, memory, and overall health—not the scan alone.
What symptoms can primary familial brain calcification cause?
PFBC can be associated with movement problems, mood changes, memory difficulties, or headaches, but symptoms vary widely. Some people remain symptom-free, and symptoms may stay stable for long periods even if calcification slowly increases.
How do doctors determine whether brain calcification is primary PFBC?
Doctors review CT or MRI findings, symptoms, family history, and any available genetic information. They also use blood tests to look for treatable secondary causes, such as parathyroid or other metabolic problems, before classifying the diagnosis as possible, probable, or definite.
Can treatment remove the calcium deposits caused by PFBC?
There is no universally established treatment described here that removes the calcium deposits. Care is usually symptom-focused, with clinicians addressing problems such as headaches, mood changes, or movement symptoms as they arise.
What follow-up is needed if I have PFBC but no symptoms?
There is no universally established imaging schedule for people without symptoms or for asymptomatic relatives. Follow-up clinical evaluations and any imaging or genetic testing should be individualized with a specialist, taking medical, psychosocial, and privacy considerations into account.

Questions For You

Answer a question to get research tailored to you. Your answers are private.

Get notified when new evidence is published on Bilateral striopallidodentate calcinosis.

We monitor PubMed for new peer-reviewed studies on this topic and email a short summary when something meaningful changes.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Based on the 2025 international consensus guidelines, how confident are you that my diagnosis is 'primary' rather than secondary to another cause?
  2. 2.Have we ruled out secondary causes of brain calcification, such as parathyroid issues or metabolic imbalances, through blood tests?
  3. 3.If I am currently asymptomatic, how frequently should I have follow-up clinical evaluations?
  4. 4.Can you explain the difference between 'imaging penetrance' and 'clinical penetrance' as it relates to my diagnosis?

References

References (18)
  1. 1

    Estimation of minimal disease prevalence from population genomic data: Application to primary familial brain calcification.

    Nicolas G, Charbonnier C, Campion D, Veltman JA

    American journal of medical genetics. Part B, Neuropsychiatric genetics : the official publication of the International Society of Psychiatric Genetics 2018; (177(1)):68-74 doi:10.1002/ajmg.b.32605.

    PMID: 29152850
  2. 2

    The Genetics of Primary Familial Brain Calcification: A Literature Review.

    Chen SY, Ho CJ, Lu YT, et al.

    International journal of molecular sciences 2023; (24(13)) doi:10.3390/ijms241310886.

    PMID: 37446066
  3. 3

    Basal ganglia calcification: 'Fahr's disease'.

    Magrinelli F, Jesuthasan A, Bhatia KP, Batla A

    Practical neurology 2025; (25(6)):520-526 doi:10.1136/pn-2024-004258.

    PMID: 40169250
  4. 4

    White matter involvement in a family with a novel PDGFB mutation.

    Biancheri R, Severino M, Robbiano A, et al.

    Neurology. Genetics 2016; (2(3)):e77 doi:10.1212/NXG.0000000000000077.

    PMID: 27227165
  5. 5

    Brain Calcification and Movement Disorders.

    Kostić VS, Petrović IN

    Current neurology and neuroscience reports 2017; (17(1)):2 doi:10.1007/s11910-017-0710-9.

    PMID: 28097511
  6. 6

    Primary Brain Calcification: An International Consensus on Nomenclature, Diagnosis, Evaluation, and Management.

    Luo W, Cen Z, Koek H, et al.

    Movement disorders : official journal of the Movement Disorder Society 2026; (41(2)):315-336 doi:10.1002/mds.70140.

    PMID: 41346103
  7. 7

    Primary familial brain calcification with known gene mutations: a systematic review and challenges of phenotypic characterization.

    Tadic V, Westenberger A, Domingo A, et al.

    JAMA neurology 2015; (72(4)):460-7 doi:10.1001/jamaneurol.2014.3889.

    PMID: 25686319
  8. 8

    Underestimated disease prevalence and severe phenotypes in patients with biallelic variants: A cohort study of primary familial brain calcification from China.

    Chen S, Cen Z, Fu F, et al.

    Parkinsonism & related disorders 2019; (64()):211-219 doi:10.1016/j.parkreldis.2019.04.009.

    PMID: 31003906
  9. 9

    Genotype-Phenotype Relations in Primary Familial Brain Calcification: Systematic MDSGene Review.

    Balck A, Schaake S, Kuhnke NS, et al.

    Movement disorders : official journal of the Movement Disorder Society 2021; (36(11)):2468-2480 doi:10.1002/mds.28753.

    PMID: 34432325
  10. 10

    Primary familial brain calcifications: genetic and clinical update.

    Westenberger A, Balck A, Klein C

    Current opinion in neurology 2019; (32(4)):571-578 doi:10.1097/WCO.0000000000000712.

    PMID: 31157644
  11. 11

    Novel findings in a Swedish primary familial brain calcification cohort.

    Sennfält S, Gustavsson P, Malmgren H, et al.

    Journal of the neurological sciences 2024; (460()):123020 doi:10.1016/j.jns.2024.123020.

    PMID: 38642488
  12. 12

    Familial Idiopathic Basal Ganglia Calcification: A Father-Son Dyad Demonstrate Heterogeneity of Presentation and Disease Progression.

    Zahniser E, Bird TD, Chen DH, et al.

    Archives of clinical neuropsychology : the official journal of the National Academy of Neuropsychologists 2022; (37(1)):217-225 doi:10.1093/arclin/acab026.

    PMID: 33893476
  13. 13

    XPR1: a Gene Linked to Primary Familial Brain Calcification Might Help Explain a Spectrum of Neuropsychiatric Disorders.

    Moura DA, Oliveira JR

    Journal of molecular neuroscience : MN 2015; (57(4)):519-21 doi:10.1007/s12031-015-0631-5.

    PMID: 26231937
  14. 14

    Brain calcification process and phenotypes according to age and sex: Lessons from SLC20A2, PDGFB, and PDGFRB mutation carriers.

    Nicolas G, Charbonnier C, de Lemos RR, et al.

    American journal of medical genetics. Part B, Neuropsychiatric genetics : the official publication of the International Society of Psychiatric Genetics 2015; (168(7)):586-94 doi:10.1002/ajmg.b.32336.

    PMID: 26129893
  15. 15

    CT-based Volume Measurement of Brain Calcification Is Related to Clinical Symptoms and Disease Progression in Primary Familial Brain Calcification.

    Snijders BMG, Pierey L, Peters MJL, et al.

    Clinical neuroradiology 2026; (36(2)):431-438 doi:10.1007/s00062-025-01595-4.

    PMID: 41296026
  16. 16

    Basal Ganglia Calcifications for Nephrologists: Fahr/Primary Familial Brain Calcification (PFBC) at the Interface of Chronic Kidney Disease-Mineral and Bone Disorder (CKD-MBD) and Hypoparathyroidism.

    Alrashidi FS

    Cureus 2025; (17(12)):e99031 doi:10.7759/cureus.99031.

    PMID: 41531582
  17. 17

    The clinical and genetic spectrum of primary familial brain calcification.

    Carecchio M, Mainardi M, Bonato G

    Journal of neurology 2023; (270(6)):3270-3277 doi:10.1007/s00415-023-11650-0.

    PMID: 36862146
  18. 18

    Astrocytes in Primary Familial Brain Calcification (PFBC): Emphasis on the Importance of Induced Pluripotent Stem Cell-Derived Human Astrocyte Models.

    Kavakli E, Gul N, Begentas OC, Kiris E

    Advances in experimental medicine and biology 2025; (1479()):19-38 doi:10.1007/5584_2024_840.

    PMID: 39841380

This page explains primary familial brain calcification for informational purposes and does not constitute medical advice. A neurologist or neurogenetics specialist should interpret your scans, test results, and follow-up needs.