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PubMed This is a summary of 59 peer-reviewed journal articles Updated
Neurology

Posterior Cortical Atrophy: A Patient Guide

At a Glance

Posterior cortical atrophy is a rare brain syndrome that makes it hard to interpret visual and spatial information even when eye exams are normal. It is usually linked to Alzheimer’s disease, and support focuses on specialist assessment, simpler surroundings, and practical daily adaptations.

Posterior Cortical Atrophy (PCA) is a rare and often misunderstood neurological syndrome that fundamentally alters the way your brain interprets the visual world. Unlike the more common forms of dementia that begin with forgetting names or dates, PCA begins at the back of the brain—in the parietal and occipital lobes—which act as the primary networks for processing spatial and visual information [1][2]. For many people, this means that while their eye exams are normal and they can still read an eye chart, the brain struggles to assemble those images into a coherent picture, making tasks like reading, judging distances, or locating an object on a cluttered table feel increasingly difficult [3][4].

Because these symptoms are so focused on vision, many patients spend years visiting eye specialists and updating eyeglass prescriptions before reaching a correct diagnosis. This “diagnostic odyssey” is a hallmark of PCA, but understanding the underlying cause is the first step toward finding the right support [3][5]. In the vast majority of cases, PCA is a unique manifestation of Alzheimer’s disease pathology—specifically the buildup of amyloid and tau proteins—that has concentrated in the visual centers rather than the memory centers of the brain [6][7]. This distinction is critical because it means that your personality, your memories, and your ability to communicate may remain relatively preserved early on, even as your visual-spatial skills change [8][9].

Living with PCA requires a specialized approach to care that moves beyond traditional dementia management. Because your brain is easily overwhelmed by visual competition, your environment becomes your most important tool; simplifying your surroundings by decluttering and creating consistent, predictable spaces can significantly reduce daily frustration [10][11]. A multidisciplinary team of neurologists, low-vision specialists, and occupational therapists can help you adapt, focusing on tactile and auditory strategies to compensate for visual challenges [2][12].

Note: PCA is a syndrome with several possible causes, and symptoms and progression vary from person to person. This guide is meant to support, not replace, individualized neurological, ophthalmic, and rehabilitation assessment.

In this guide

5 chapters

01

Understanding Posterior Cortical Atrophy (PCA)

Learn how posterior cortical atrophy (PCA) affects visual processing, which symptoms to watch for, and how MRI and biomarker tests help doctors diagnose it.

02

Symptoms and the Progression of PCA

Learn how posterior cortical atrophy (PCA) changes vision, reading, balance, and memory over time, plus emergency warning signs and when to contact a specialist.

03

Diagnosing PCA: Scans, Tests, and Biomarkers

Learn how posterior cortical atrophy (PCA) is diagnosed with neuropsychological testing, MRI, FDG-PET, amyloid and tau scans, and spinal fluid biomarkers.

04

Medical Treatments for PCA

Learn about posterior cortical atrophy treatments, including donepezil, memantine, anti-amyloid drugs, ARIA risks, MRI monitoring, and support for visual function.

05

Daily Life, Adaptations, and Care Team

Learn how posterior cortical atrophy affects daily life, driving, home safety, mood, and care teams, with practical adaptations to support independence.

Common questions in this guide

What is posterior cortical atrophy, and how is it different from other dementias?
Posterior cortical atrophy is a rare neurological syndrome that first affects how the brain interprets visual and spatial information. Reading, judging distances, and finding objects may become difficult while memory, personality, and communication remain relatively preserved early on. In many cases, the underlying disease is Alzheimer’s disease.
Can I have posterior cortical atrophy if my eye examination is normal?
Yes. PCA affects the brain’s processing of visual information rather than necessarily affecting the eyes themselves, so an eye chart and routine eye examination may be normal. Persistent difficulty interpreting images or navigating spaces can still require neurological assessment.
Is posterior cortical atrophy always caused by Alzheimer’s disease?
No. Most cases are associated with Alzheimer’s disease changes involving amyloid and tau proteins in visual areas of the brain, but PCA is a syndrome with several possible causes. Your care team can use your history and testing to investigate the underlying cause.
Which specialists can help someone with posterior cortical atrophy?
A neurologist can help evaluate the syndrome and its possible cause, while eye specialists, low-vision professionals, and occupational therapists can address visual and daily-life challenges. Working with a multidisciplinary team can help tailor safety changes and practical strategies to your needs.
What changes at home can make posterior cortical atrophy easier to manage?
Reducing clutter and keeping belongings in consistent, predictable places can make visual information less overwhelming. Tactile and auditory strategies, such as using touch or sound to supplement vision, may also support daily activities and independence.
How can I explain PCA to family and friends?
Explain that PCA can make it difficult for the brain to interpret objects, spaces, or written information even when the eyes appear normal. Early in the syndrome, a person may still remember conversations and communicate well, so the visual difficulty may not be obvious to others.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Given that PCA is rare and easily misdiagnosed, how many other patients with this specific condition have you managed?
  2. 2.Does our current care plan prioritize my visual and spatial challenges, or is it based on a more traditional memory-loss model?
  3. 3.What specific markers from my testing indicate that my symptoms are caused by Alzheimer's pathology rather than another condition?
  4. 4.Which member of my care team will be my primary point of contact for navigating the environmental and safety changes I need to make?
  5. 5.Can you recommend a therapist or support group that focuses on younger-onset or atypical forms of dementia?

Questions For You

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References

References (12)
  1. 1

    Posterior Cortical Atrophy.

    Schott JM, Crutch SJ

    Continuum (Minneapolis, Minn.) 2019; (25(1)):52-75 doi:10.1212/CON.0000000000000696.

    PMID: 30707187
  2. 2

    Consensus recommendations for clinical assessment tools for the diagnosis of posterior cortical atrophy syndrome from the Atypical AD PIA of ISTAART.

    Pelak VS, Tang-Wai DF, Boeve BF, et al.

    Alzheimer's & dementia (Amsterdam, Netherlands) 2023; (15(3)):e12474 doi:10.1002/dad2.12474.

    PMID: 39329067
  3. 3

    Longitudinal Evolution of Posterior Cortical Atrophy: Diagnostic Delays, Overlapping Phenotypes, and Clinical Outcomes.

    Shir D, Lee N, McCarter SJ, et al.

    Neurology 2025; (104(9)):e213559 doi:10.1212/WNL.0000000000213559.

    PMID: 40198862
  4. 4

    Pop-out illusion as the initial presentation of posterior cortical atrophy.

    Prabhakar TA

    Neurocase 2021; (27(3)):266-269 doi:10.1080/13554794.2021.1929333.

    PMID: 34128452
  5. 5

    [Posterior cortical atrophy-plus syndrome. A case report].

    Saleh C, Seidl U, Stegentritt K, et al.

    Fortschritte der Neurologie-Psychiatrie 2020; (88(8)):528-531 doi:10.1055/a-1149-2057.

    PMID: 32634845
  6. 6

    Demographic, clinical, biomarker, and neuropathological correlates of posterior cortical atrophy: an international cohort study and individual participant data meta-analysis.

    Chapleau M, La Joie R, Yong K, et al.

    The Lancet. Neurology 2024; (23(2)):168-177 doi:10.1016/S1474-4422(23)00414-3.

    PMID: 38267189
  7. 7

    Association of APOE4 and Clinical Variability in Alzheimer Disease With the Pattern of Tau- and Amyloid-PET.

    La Joie R, Visani AV, Lesman-Segev OH, et al.

    Neurology 2021; (96(5)):e650-e661 doi:10.1212/WNL.0000000000011270.

    PMID: 33262228
  8. 8

    Attention network dysfunction underlies memory impairment in posterior cortical atrophy.

    Veldsman M, Zamboni G, Butler C, Ahmed S

    NeuroImage. Clinical 2019; (22()):101773 doi:10.1016/j.nicl.2019.101773.

    PMID: 30991615
  9. 9

    Splenial white matter integrity is associated with memory impairments in posterior cortical atrophy.

    Overman MJ, Zamboni G, Butler C, Ahmed S

    Brain communications 2021; (3(2)):fcab060 doi:10.1093/braincomms/fcab060.

    PMID: 34007964
  10. 10

    Effects of the visual environment on object localization in posterior cortical atrophy and typical Alzheimer's disease.

    Ocal D, McCarthy ID, Poole T, et al.

    Frontiers in medicine 2023; (10()):1102510 doi:10.3389/fmed.2023.1102510.

    PMID: 36926317
  11. 11

    Cognitive rehabilitation in posterior cortical atrophy.

    Suárez-González A, Bier N, Sauvageau H, et al.

    Practical neurology 2025; (25(1)):40-44 doi:10.1136/pn-2024-004259.

    PMID: 39515839
  12. 12

    Effects of a Hybrid Model of Occupational Therapy on Visuospatial Perception and Functional Skills for Cases With Posterior Cortical Atrophy: A Five-Case Report.

    Hsu HY, Kuo LC, Kuan TS, et al.

    American journal of Alzheimer's disease and other dementias 2024; (40()):15333175241312664 doi:10.1177/15333175241312664.

    PMID: 40955585

This guide about posterior cortical atrophy is for informational purposes only and does not constitute medical advice. Your neurologist, eye-care specialist, and rehabilitation team can provide individualized guidance on diagnosis, safety, and daily support.

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