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PubMed This is a summary of 20 peer-reviewed journal articles Updated
Neurology

Recognizing the Signs: CTX Symptoms Across the Lifespan

At a Glance

Cerebrotendinous xanthomatosis (CTX) is a progressive metabolic disorder with symptoms that evolve over a lifetime. Early signs include unexplained infant diarrhea and juvenile cataracts, while later stages involve tendon xanthomas and severe neurological challenges.

Cerebrotendinous xanthomatosis (CTX) is often called a “chameleon” disease because its symptoms change significantly as a person grows and can easily be mistaken for more common conditions [1]. Because the toxic buildup of cholestanol happens slowly, the signs of CTX emerge in stages across the lifespan [2][3].

Understanding these stages is vital because the average time from the first symptom to a correct diagnosis is approximately 16.5 years [4]. This delay occurs because the early “red flags” are often treated by different specialists—like eye doctors or GI doctors—who may not realize they are looking at a single, systemic metabolic disorder [5].

Infancy and Childhood: The Early Red Flags

The very first signs of CTX often appear shortly after birth or in early childhood. These symptoms are frequently dismissed as common childhood ailments, but when they occur together, they are strong indicators of CTX.

  • Chronic Unexplained Diarrhea: This is often the earliest sign, sometimes beginning in infancy. It is typically persistent and does not have a clear digestive cause [6][7].
  • Neonatal Cholestasis: Some infants may experience jaundice (yellowing of the skin or eyes) or cholestasis (interrupted bile flow) shortly after birth [8][9].
  • Juvenile Bilateral Cataracts: This is considered a critical early red flag. These cataracts typically appear in both eyes before the age of 20 and often have a unique “fleck-like” or lace-like appearance under a microscope [6][2][10].

Adolescence and Early Adulthood: Physical and Mental Shifts

As a person enters their teenage years or early twenties, new symptoms often emerge that affect physical appearance and behavior.

  • Tendon Xanthomas: These are fatty, yellowish swellings that develop on the tendons. They most commonly appear on the Achilles tendons (the back of the heels) but can also be found on the elbows or knees [11][3].
  • Learning and Cognitive Difficulties: Many children and teens with CTX experience intellectual disabilities or difficulties in school that may worsen over time [12][13].
  • Psychiatric Symptoms: Behavior changes are common during this stage. These can include apathy (lack of interest), aggression, impulsivity, or symptoms that mimic ADHD [14][15].

Adulthood: Progressive Neurological Challenges

If CTX remains undiagnosed into adulthood, the continued buildup of cholestanol begins to cause more severe damage to the central nervous system.

  • Spastic Paraparesis: This refers to stiffness and weakness in the legs, which can make walking difficult and may lead to a “stiff-legged” gait [13][16].
  • Cerebellar Ataxia: This is a lack of muscle coordination that causes problems with balance, frequent falls, and clumsy movements [2][17].
  • Peripheral Neuropathy: Damage to the nerves outside the brain and spinal cord can cause tingling, numbness, or weakness in the hands and feet [2][18].
  • Cognitive Decline: Adults may experience worsening memory loss, executive dysfunction (trouble planning or organizing), and eventually dementia [12][13].

A Variable Path

It is important to remember that CTX is highly variable. One person may have severe cataracts but no diarrhea, while another might have psychiatric symptoms as their first major sign [5][19]. It is completely normal if you do not experience every symptom listed here; the disease presents differently in everyone. Even within the same family, siblings with the exact same genetic mutation may experience different symptoms at different ages [19][20]. This variability is one of the main reasons why recognizing the full spectrum of signs is so important for reaching an accurate diagnosis.

Common questions in this guide

What are the earliest signs of CTX in babies and children?
The earliest signs of CTX often include persistent, unexplained diarrhea and neonatal cholestasis or jaundice. These symptoms can appear shortly after birth or in early childhood, making them easily mistaken for common childhood ailments.
Are childhood cataracts a sign of CTX?
Yes, juvenile bilateral cataracts are considered a critical early red flag for CTX. These cataracts typically develop in both eyes before the age of 20 and often have a distinct fleck-like or lace-like appearance.
What are tendon xanthomas and where do they form?
Tendon xanthomas are fatty, yellowish swellings that develop due to the buildup of cholestanol. In people with CTX, they most commonly form on the Achilles tendons at the back of the heels, but they can also appear on the elbows and knees.
How does CTX affect adults neurologically?
If left undiagnosed, the continued buildup of cholestanol can cause severe nervous system damage in adults. This can lead to stiff legs, lack of muscle coordination, tingling in the hands and feet, memory loss, and progressive cognitive decline.
Why is it so difficult to get a CTX diagnosis?
CTX is often called a "chameleon" disease because its early symptoms, like diarrhea and cataracts, are usually treated by different specialists. It takes an average of 16.5 years to receive a correct diagnosis because providers often don't realize these early signs are connected.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Since juvenile cataracts are a major red flag, can you confirm if my (or my child's) cataracts fit the 'fleck-like' description typical of CTX?
  2. 2.Given that symptoms are highly variable, how does my (or my child's) current presentation compare to the typical progression of the disease?
  3. 3.Are the psychiatric symptoms we are seeing, such as apathy or aggression, common for this stage of CTX?
  4. 4.If there is no sign of tendon xanthomas yet, does that rule out certain future complications, or could they still develop later?
  5. 5.What is the plan for monitoring neurological health, such as balance and motor skills, as I (or my child) get older?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (20)
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    Clinical, biochemical, and molecular insights into Cerebrotendinous Xanthomatosis: A nationwide study of 100 Turkish individuals.

    Zubarioglu T, Kıykım E, Köse E, et al.

    Molecular genetics and metabolism 2024; (142(2)):108493 doi:10.1016/j.ymgme.2024.108493.

    PMID: 38772327
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    Cerebrotendinous Xanthomatosis, a Treatable Disorder Often Missed: Case Series of Three Patients Confirmed by Genetic Testing.

    Yaqoob A, Dar WR, Raina A, et al.

    Neurology India 2024; (72(1)):138-141 doi:10.4103/ni.ni_1093_21.

    PMID: 38443015
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    An unusual cause of Achilles tendon xanthoma.

    Parente F, Vesnaver M, Massie R, Baass A

    Journal of clinical lipidology 2016; (10(4)):1040-1044 doi:10.1016/j.jacl.2016.05.001.

    PMID: 27578138
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    Nationwide survey on cerebrotendinous xanthomatosis in Japan.

    Sekijima Y, Koyama S, Yoshinaga T, et al.

    Journal of human genetics 2018; (63(3)):271-280 doi:10.1038/s10038-017-0389-4.

    PMID: 29321515
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    Case Report: a novel CYP27A1 gene variant in a patient with cerebrotendinous xanthomatosis with unusual clinical findings.

    Tama Viteri FA, Cotán Marín D, Sánchez FAT, Sánchez MAT

    The International journal of neuroscience 2025; (135(3)):358-366 doi:10.1080/00207454.2023.2300735.

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    Juvenile Cataract and Chronic Diarrhea: A Single Etiology.

    Risto MI, Sobrosa P, Vilela M, Sousa L

    Cureus 2025; (17(2)):e79760 doi:10.7759/cureus.79760.

    PMID: 40161147
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    Early diagnosis for cerebrotendinous xanthomatosis with juvenile cataract and family history.

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    Ophthalmic genetics 2023; (44(4)):361-365 doi:10.1080/13816810.2023.2197492.

    PMID: 37017268
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    Sterol 27-Hydroxylase Deficiency as a Cause of Neonatal Cholestasis: Report of 2 Cases and Review of the Literature.

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    Frontiers in pediatrics 2020; (8()):616582 doi:10.3389/fped.2020.616582.

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    Severe Neonatal Cholestasis in Cerebrotendinous Xanthomatosis: Genetics, Immunostaining, Mass Spectrometry.

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    PMID: 29079218
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    Bilateral Xanthomas of Tendoachilles in A Patient of Cerebrotendinous Xanthomatosis - A Rare Case Report and Review of Literature.

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    Cognitive impairment in children and adults with cerebrotendinous xanthomatosis: A French cohort study.

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    Journal of inherited metabolic disease 2024; (47(5)):1069-1079 doi:10.1002/jimd.12765.

    PMID: 38897600
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    Cerebellar hypometabolism with normal structural findings in Cerebrotendinous xanthomatosis. A case report.

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    Case report: Cerebrotendinous Xanthomatosis masquerading as adult ADHD in psychiatric practice.

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    Case report: Cerebrotendinous xanthomatosis with a novel mutation in the CYP27A1 gene mimicking behavioral variant frontotemporal dementia.

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    Clinical, electrophysiological, and genetic characteristics of cerebrotendinous xanthomatosis in South Korea.

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    Movement disorders in cerebrotendinous xanthomatosis.

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This page is for informational purposes only and does not replace professional medical advice. Always consult your healthcare provider if you or your child are experiencing symptoms that could be related to CTX.

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