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Case Reports

Homonymous Visual Field Loss without Structural Lesion on Magnetic Resonance Imaging: Documented with Positron Emission Tomography and Diffusion Tensor Imaging

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Pages 238-242 | Received 09 Aug 2013, Accepted 12 Feb 2014, Published online: 22 Jul 2014
 

Abstract

The authors describe a 35-year-old man suffering from homonymous hemianopia after head trauma 4 years before but with negative magnetic resonance imaging (MRI) findings. Brain fluorine-18 fluorodeoxyglucose positron emission tomography (18FDG-PET) showed hypometabolism at the unilateral occipital lobe and crossed cerebellar hemisphere, and diffusion tensor imaging (DTI) revealed that the ipsilateral optic radiations were completely interrupted. The crossed cerebellar diaschisis (CCD) observed in the chronic stage of brain damage was caused by cerebellar suppression of the cerebral blood flow due to an involvement of the corticopontocerebellar tract. PET and DTI provide objective means for determining the relationship of functional deficits to head trauma, even in cases where the injury was sustained years prior to the evaluation.

Acknowledgements

This work was supported by Research Institute of Clinical Medicine of Chonbuk National University–Chonbuk National University Hospital, and by the Korea Science and Engineering Foundation (KOSEF) NLRL program grant funded by the Korean Government (MEST) (2011-0028333).

Declaration of interest: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.

Note: Figure 2 of this article is avaialbe in colour online at http://www.informahealthcare.com/oph.

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