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Image of the moment
Don’t forget the fornix
  1. Maurice Sidra1,2,
  2. Louise Hattingh3,
  3. Hawraman Ramadan1
  1. 1 Neurology, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, UK
  2. 2 Neurology, Leeds General Infirmary, Leeds, UK
  3. 3 Radiology, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, UK
  1. Correspondence to Dr Maurice Sidra, Neurology, Bradford Royal Infirmary, Bradford BD9 6RJ, UK; m.sidra{at}nhs.net

https://doi.org/10.1136/practneurol-2020-002802

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    Case description

    A 52-year-old man presented with acute onset of primarily anterograde amnesia. He had a history of diabetes mellitus, coronary artery disease and smoking. We found no other focal neurological deficits. The amnesia improved slowly over the subsequent weeks.

    MR scan of the brain showed moderate chronic microangiopathic white matter changes and acute infarction in both fornices (figure 1). This most likely explained the abrupt onset of anterograde amnesia and prolonged recovery.

    Figure 1

    Axial diffusion weighted MRI (A) and apparent diffusion coefficient image (B) showing the acute diffusion restriction in both fornices (arrows), consistent with bilateral acute fornix infarction.

    The fornix

    Anatomy and function

    The fornices are white matter tract bundles that lie on the medial aspects of the cerebral hemispheres. They each contain output fibres arising …

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    Footnotes

    • Contributors All authors contributed to the conception of the manuscript. MS and HR contributed to the design of the manuscript, editing the manuscript and review of the relevant literature. LH interpreted the neuroimaging studies and supplied the relevant images.

    • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

    • Competing interests None declared.

    • Provenance and peer review Not commissioned. Externally peer reviewed by Thomas Miller, London, UK.

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