A Hippocampal Lesion Detected by High-Field 3 Tesla Magnetic Resonance Imaging in a Patient with Temporal Lobe Epilepsy

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  • Sawaishi Yukio
    Department of Pediatrics, Akita University School of Medicine
  • Sasaki Makoto
    Department of Radiology, Iwate University School of Medicine
  • Yano Tamami
    Department of Pediatrics, Akita University School of Medicine
  • Hirayama Aya
    Department of Pediatrics, Akita University School of Medicine
  • Akabane Jinzo
    Department of Pediatrics, Nakadori General Hospital
  • Takada Goro
    Department of Pediatrics, Akita University School of Medicine

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Abstract

Nearly 80% of patients with temporal lobe epilepsy have some types of lesion identified by conventional 1.5 tesla (T) magnetic resonance imaging (MRI). We performed high-field 3 T MRI in a 5-year-old patient with recurrent complex partial seizures who was diagnosed as having right temporal lobe epilepsy based on the results of single photon emission computed tomography and ictal video-electroencephalogram monitoring, because 1.5 T MRI failed to detect any abnormalities in the suspected region. High-field 3 T MRI revealed a small high-intensity lesion on fast spin-echo short inversion time inversion-recovery images of the hippocampus, possibly responsible for the seizures. This is the first report detecting a hippocampal lesion by 3 T MRI, which could not be found by conventional 1.5 T MRI.

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