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Peer-Reviewed Publication
J Neuroradiol2026;53(5):101575.June 16, 2026Journal Article

Orbitofrontal atrophy on MRI appears to be an indicator of C9orf72 repeat expansion status in FTD.

Niko Yli-Anttila1, Eino Solje2, Kalle Aho3, Kasper Katisko3, Ave Kivisild3, Helmi Soppela3, Johanna Krüger4, Päivi Hartikainen5, Jyrki Lötjönen6, Juhana Hakumäki7
1Department of Clinical Radiology, Kuopio University Hospital, Kuopio, Finland; Institute of Clinical Medicine - Radiology, University of Eastern Finland, Kuopio, Finland.
2Neuro Center - Neurology, Kuopio University Hospital, Kuopio, Finland; Institute of Clinical Medicine - Neurology, University of Eastern Finland, Kuopio, Finland.
3Institute of Clinical Medicine - Neurology, University of Eastern Finland, Kuopio, Finland.
4Research Unit of Clinical Medicine, Neurology, University of Oulu, Oulu, Finland; Neurocenter, Neurology, Oulu University Hospital, Oulu, Finland; Medical Research Center, Oulu University Hospital, Oulu, Finland.
5Neuro Center - Neurology, Kuopio University Hospital, Kuopio, Finland.
6Combinostics Ltd., Tampere, Finland.
7Department of Clinical Radiology, Kuopio University Hospital, Kuopio, Finland; Institute of Clinical Medicine - Radiology, University of Eastern Finland, Kuopio, Finland. Electronic address: juhana.hakumaki@uef.fi.

Abstract

Frontotemporal dementia (FTD) is an important group of neurodegenerative diseases causing early onset dementia. While FTD is mostly sporadic, a common cause of genetic FTD is the C9orf72 hexanucleotide repeat expansion (C9exp). To date, no imaging biomarkers have been identified for differentiating between sporadic and hereditary cases. In this study, we focused on MRI-based neuroanatomical compar…

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