PET and MRI imaging can now help detect LATE, a dementia often mistaken for Alzheimer’s, guiding earlier and more personalized care.
Memory loss in older adults has long been a clinical puzzle. While Alzheimer’s disease has dominated research and headlines, a quietly emerging condition called limbic-predominant age-related TDP-43 encephalopathy (LATE) has been flying under the radar.
LATE mimics Alzheimer’s so closely that many patients have been misdiagnosed for years. LATE arises from different brain changes than Alzheimer’s, meaning the treatments and prognosis may vary. In other words, not all memory loss is created equal.
“This distinction is critical, especially in the era of anti-amyloid therapies,” says Dr Satoshi Minoshima, professor of Radiology and Imaging Sciences at the University of Utah. “Because LATE has a different underlying pathology and a seemingly different prognosis, it cannot be diagnosed or treated in the same way as Alzheimer’s disease [1].”
If Alzheimer’s is like a house slowly filling with toxic clutter (amyloid and tau proteins), LATE is more like a hidden wiring problem in the brain’s memory circuits (TDP-43 protein clumps in the limbic system). The symptoms – forgetfulness and trouble recalling recent events – look nearly identical to Alzheimer’s, but the cause is different.
Until now, LATE could be identified only definitively after death. Without approved biomarkers, physicians had to rely on PET and MRI scans combined with clinical judgment, a process prone to uncertainty and misdiagnosis. This has left a gap in care for many older adults.
Researchers have now developed a quantitative imaging framework using PET and MRI scans to detect LATE in living patients [2]. It’s giving doctors a detailed map of the brain that highlights subtle changes invisible to the naked eye.
The study examined 944 patients with memory complaints and found:
- 2.4% with “pure” LATE
- 10.6% with LATE overlapping Alzheimer’s
- 23.7% with Alzheimer’s alone
MRI scans revealed that LATE predominantly affects the medial temporal lobe, the brain’s memory hub, while overlapping cases involve multiple regions, suggesting that Alzheimer’s and LATE may sometimes accelerate one another. In a sense, these conditions may “team up” to worsen memory decline.
“This gives clinicians a practical tool to detect potential LATE pathology,” says Minoshima. “It can inform treatment decisions today and guide future research tomorrow.”
Longevity.Technology: Why does this matter for the broader conversation about longevity? Because living longer is only part of the story, living cognitively healthy matters just as much. Early detection of LATE could allow patients to tailor lifestyle strategies, participate in relevant clinical trials and plan interventions tailored to their unique brain health profile.
Moreover, this discovery is a reminder that aging is not one-size-fits-all. Two people with memory decline may have very different underlying causes, requiring different approaches for prevention, treatment and care. Precision diagnostics like this are a small but critical step toward personalized brain health in aging populations.
While PET and MRI scans are not yet a replacement for definitive biomarkers, this framework represents progress toward precision neurology in older adults. Distinguishing LATE from Alzheimer’s (or recognizing when both coexist) gives doctors a clearer roadmap for care and accelerates research into therapies that could truly extend healthspan as well as the years we remain sharp, independent and engaged.
Image created by Pei Ing Ngam, Department of Diagnostic Imaging, National University Hospital Singapore, Singapore, and Department of Radiology and Imaging Sciences, University of Utah, Salt Lake City, Utah.
[1] https://www.news-medical.net/news/20260226/Imaging-technique-can-objectively-identify-a-recently-recognized-type-of-dementia-LATE.aspx?utm_source=news_medical_newsletter&utm_medium=email&utm_campaign=alzheimer_s_disease_newsletter_1_march_2026
[2] https://snmmi.org/Web/News/Articles/Quantitative-FDG-PET-and-MRI-Framework-Detects-Emerging-Form-of-Dementia—LATE-.aspx
