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PubMed This is a summary of 17 peer-reviewed journal articles Updated
Neurology · Primary Familial Brain Calcification

Diagnosis: Scans, Biology, and Crucial Look-Alikes

At a Glance

PFBC is diagnosed by confirming a characteristic pattern of brain calcium on a CT scan without contrast, checking calcium, phosphate, parathyroid hormone, magnesium, vitamin D, and kidney function, and excluding other causes; genetic testing may help confirm the diagnosis.

Finding calcification on a brain scan is often the beginning of a diagnostic journey, not the end. While “Primary Familial Brain Calcification” (PFBC) is a specific genetic condition, many other health issues can cause calcium to build up in the brain [1][2]. Because of this, PFBC is known as a diagnosis of exclusion—it is confirmed after your care team has carefully ruled out other, often treatable, causes [3][2].

The Essential “Look-Alike” Check

The most critical step in your diagnosis is a series of blood tests known as a mineral panel [4][5]. This is because conditions like hypoparathyroidism (where the body doesn’t produce enough parathyroid hormone) can mimic the brain scans of PFBC almost exactly [5][6]. Unlike PFBC, hypoparathyroidism is often treated with specific mineral supplements that can manage symptoms effectively. Keep in mind that calcium and active vitamin D require supervised dosing and kidney monitoring, they do not necessarily reverse existing calcification, and should not be started or changed by the patient [6]. Evaluation should also consider age-related physiologic calcification and infectious, mitochondrial, developmental, and toxic causes.

To ensure your diagnosis is accurate, the following tests are considered standard for anyone with bilateral brain calcification [5][7][4]:

  • Serum Calcium & Albumin: To check the actual level of calcium available to your body. (Corrected or ionized calcium may be needed).
  • Phosphate: High levels can signal a metabolic issue rather than a genetic one.
  • Intact Parathyroid Hormone (PTH): To see if your parathyroid glands are functioning correctly. (PTH must be interpreted with calcium and magnesium).
  • Magnesium & Vitamin D: To rule out common deficiencies that affect mineral balance.
  • Renal Function (Creatinine/eGFR): To ensure your kidneys are processing minerals properly.

Why Your Brain is Calcifying

PFBC mechanisms are proposed to involve phosphate transport and neurovascular health, though this differs among genes and remains incompletely understood [8][9]. In a healthy brain, a delicate balance of phosphate is maintained by specific “gatekeeper” proteins:

  • SLC20A2 (PiT2): This protein acts like a vacuum, pulling phosphate into cells [8].
  • XPR1: This protein acts like an exhaust fan, pushing excess phosphate out of cells [9].

When the genes for these proteins don’t work correctly, phosphate regulation is disrupted. Other genes, like PDGFB/PDGFRB, MYORG, JAM2, and NAA60 involve different or incompletely understood vascular and cellular pathways [8][10]. Over time, these disruptions attract calcium, forming the hard deposits seen on a scan [11]. Do not attempt to self-restrict minerals or take over-the-counter chelation products to remove these deposits, as this can be dangerous and will not clear the calcium [10][12].

Mapping the Scans: CT vs. MRI

While you may have had both types of scans, they serve different purposes in diagnosing PFBC:

  • Non-contrast CT Scan: This is the preferred modality for finding PFBC [13]. Calcium shows up very brightly on a CT, making it the best tool for calculating your Total Calcification Score—a metric from the 2025 international consensus used to assess calcification burden, though calcification burden alone does not establish diagnostic certainty [14][15].
  • MRI: While less sensitive at “seeing” the calcium itself, an MRI may be used when clinically indicated for checking the surrounding brain tissue [16]. It helps doctors see if there is swelling, white matter changes, or other issues that might point toward a different diagnosis, such as COL4A1-related disorders [17][16].

By combining these scans with the essential blood work, checking family history, and, eventually, targeted genetic testing, your doctors can help define your specific condition [14].

Common questions in this guide

How is primary familial brain calcification diagnosed?
Doctors look for a characteristic pattern of calcium deposits on brain imaging, usually a CT scan without contrast. They also check blood tests and review family history to exclude metabolic, infectious, mitochondrial, developmental, toxic, and age-related causes; genetic testing may help in selected cases.
Which blood tests are used when brain calcification is found?
The evaluation commonly includes calcium with albumin or ionized calcium, phosphate, parathyroid hormone, magnesium, vitamin D, and creatinine or eGFR for kidney function. Results need to be interpreted together, and supplements should not be started or changed without medical guidance.
Can hypoparathyroidism look like PFBC on a brain scan?
Yes. When the parathyroid glands do not make enough hormone, calcium and phosphate balance can change and produce similar brain scan findings, but the underlying problem may have a specific treatment. Calcium and active vitamin D require supervised dosing and kidney monitoring, so do not self-treat.
Is a CT scan or MRI better for diagnosing PFBC?
A CT scan without contrast is preferred for detecting and measuring brain calcium. MRI is less sensitive for calcium but can show surrounding brain tissue, swelling, white-matter changes, or findings that suggest another condition.
What does the Total Calcification Score tell me?
It estimates the amount and distribution of calcification seen on CT using the 2025 international consensus approach. The score describes calcification burden, but it cannot by itself confirm PFBC; blood tests, clinical context, family history, and sometimes genetic testing are still needed.
Which genes may be included in PFBC testing?
Depending on your results and family history, a genetic panel may include SLC20A2, XPR1, PDGFB, PDGFRB, MYORG, JAM2, and NAA60. A genetics professional can explain which genes are appropriate and what a result would mean.
What other conditions can cause brain calcification besides PFBC?
Brain calcification can also occur with hypoparathyroidism and other mineral disorders, age-related changes, infections, mitochondrial or developmental conditions, toxic exposures, and some genetic disorders such as COL4A1-related disorders. Doctors use blood tests, imaging, medical history, and sometimes genetic testing to distinguish these causes.

Questions For You

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Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Were my calcium, phosphate, and PTH levels checked before I started any vitamin or mineral supplements?
  2. 2.Are my lab results consistent with hypoparathyroidism or another metabolic condition that would require a different treatment plan?
  3. 3.Can you explain my 'Total Calcification Score' from the 2025 international consensus guidelines?
  4. 4.Does my CT scan show the 'symmetric' pattern typical of PFBC, and are there other areas beyond the basal ganglia involved?
  5. 5.Given that PFBC is a diagnosis of exclusion, what other conditions have we officially ruled out?
  6. 6.If my lab work is normal, what specific genes (like SLC20A2 or XPR1) should be included in my genetic testing panel?

References

References (17)
  1. 1

    Ossified blood vessels in primary familial brain calcification elicit a neurotoxic astrocyte response.

    Zarb Y, Weber-Stadlbauer U, Kirschenbaum D, et al.

    Brain : a journal of neurology 2019; (142(4)):885-902 doi:10.1093/brain/awz032.

    PMID: 30805583
  2. 2

    White matter disorders with cerebral calcification in adulthood.

    Chelban V, Houlden H

    Handbook of clinical neurology 2024; (204()):111-131 doi:10.1016/B978-0-323-99209-1.00024-7.

    PMID: 39322374
  3. 3

    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
  4. 4

    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
  5. 5

    Hypoparathyroidism with Fahr's syndrome: A case report and review of the literature.

    Zhou YY, Yang Y, Qiu HM

    World journal of clinical cases 2019; (7(21)):3662-3670 doi:10.12998/wjcc.v7.i21.3662.

    PMID: 31750351
  6. 6

    Eiken syndrome presenting as pseudohypoparathyroidism due to PTH1R gene pathogenic variant.

    Manasa CVS, Guddeti A, Bora A, et al.

    JCEM case reports 2026; (4(11)):luag300 doi:10.1210/jcemcr/luag300.

    PMID: 42824313
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    Silent stone: Idiopathic presentation of Fahr's disease.

    Jung JK, Zazay I, Burmeister JR, Khan A

    SAGE open medical case reports 2025; (13()):2050313X251395982 doi:10.1177/2050313X251395982.

    PMID: 41322693
  8. 8

    SLC20A2 Deficiency in Mice Leads to Elevated Phosphate Levels in Cerbrospinal Fluid and Glymphatic Pathway-Associated Arteriolar Calcification, and Recapitulates Human Idiopathic Basal Ganglia Calcification.

    Wallingford MC, Chia JJ, Leaf EM, et al.

    Brain pathology (Zurich, Switzerland) 2017; (27(1)):64-76 doi:10.1111/bpa.12362.

    PMID: 26822507
  9. 9

    Interplay between primary familial brain calcification-associated SLC20A2 and XPR1 phosphate transporters requires inositol polyphosphates for control of cellular phosphate homeostasis.

    López-Sánchez U, Tury S, Nicolas G, et al.

    The Journal of biological chemistry 2020; (295(28)):9366-9378 doi:10.1074/jbc.RA119.011376.

    PMID: 32393577
  10. 10

    Astrocytes modulate brain phosphate homeostasis via polarized distribution of phosphate uptake transporter PiT2 and exporter XPR1.

    Cheng X, Zhao M, Chen L, et al.

    Neuron 2024; (112(18)):3126-3142.e8 doi:10.1016/j.neuron.2024.06.020.

    PMID: 39019040
  11. 11

    Mice Knocked Out for the Primary Brain Calcification-Associated Gene Slc20a2 Show Unimpaired Prenatal Survival but Retarded Growth and Nodules in the Brain that Grow and Calcify Over Time.

    Jensen N, Schrøder HD, Hejbøl EK, et al.

    The American journal of pathology 2018; (188(8)):1865-1881 doi:10.1016/j.ajpath.2018.04.010.

    PMID: 29803831
  12. 12

    Astrocyte-microglial association and matrix composition are common events in the natural history of primary familial brain calcification.

    Nahar K, Lebouvier T, Andaloussi Mäe M, et al.

    Brain pathology (Zurich, Switzerland) 2020; (30(3)):446-464 doi:10.1111/bpa.12787.

    PMID: 31561281
  13. 13

    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
  14. 14

    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
  15. 15

    Evaluation of MYORG mutations as a novel cause of primary familial brain calcification.

    Chen Y, Fu F, Chen S, et al.

    Movement disorders : official journal of the Movement Disorder Society 2019; (34(2)):291-297 doi:10.1002/mds.27582.

    PMID: 30589467
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    A novel MYORG mutation causes primary familial brain calcification with migraine: Case report and literature review.

    Song T, Zhao Y, Wen G, et al.

    Frontiers in neurology 2023; (14()):1110227 doi:10.3389/fneur.2023.1110227.

    PMID: 36816548
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    Brain hypoperfusion and nigrostriatal dopaminergic dysfunction in primary familial brain calcification caused by novel MYORG variants: case report.

    Chen SY, Lin WC, Chang YY, et al.

    BMC neurology 2020; (20(1)):329 doi:10.1186/s12883-020-01910-1.

    PMID: 32873236

This page is for informational purposes only and does not constitute medical advice. It describes PFBC testing and possible look-alike conditions; ask your care team before changing calcium, vitamin D, or other supplements.