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From the Department of Clinical and Experimental Epilepsy (Drs. Powell, Symms, Boulby, Koepp, and Duncan) and NMR Research Unit (C.A.M. Wheeler-Kingshott), Institute of Neurology, and Department of Computer Science (Dr. Alexander), University College London, Imaging Science and Biomedical Engineering (Dr. Parker), University of Manchester, and Centre for Neuroimaging Sciences (Dr. Barker), Institute of Psychiatry, Kings College London, UK.
Address correspondence and reprint requests to Dr Duncan, Department of Clinical and Experimental Epilepsy, Institute of Neurology, Queen Square, London, WC1N 3BG, UK; e-mail: j.duncan{at}ion.ucl.ac.uk
A superior homonymous quadrantanopia is a well recognized complication of anterior temporal lobe resection and occurs because of disruption of the Meyer loop, the anterior part of the optic radiation. The authors used diffusion tensor imaging tractography to visualize the optic radiation before and after surgery, demonstrating the disruption of Meyer loop in a patient who developed a quadrantanopia. Preoperative imaging of the optic radiation will be useful in predicting visual field defects following temporal lobe resection.
Supported by the Wellcome Trust (programme grant no. 067176; H.W.R.P., M.R.S.), Action Medical Research (P.A.B.), and the National Society for Epilepsy (M.J.K., J.D.). C.W.K. was funded by the Multiple Sclerosis Society of Great Britain and Northern Ireland during this study.
Disclosure: The authors report no conflicts of interest.
Received January 19, 2005. Accepted in final form April 6, 2005.
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