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Table 1: Details of cases and controls
Subjects Controls
Mean age (range) (yr) 34.6 (18–58) 42.8 (21–79)
Men 24 13
Women 27 38
Selection source Pathology database RIS search and review
Inclusion criteria Age older than 18 yr Age older than 18 yr
Pathologically proven MTS Brain and orbital MRI
Coronal FLAIR images extending across hippocampi
Exclusion criteria Preoperative coronal FLAIR through hippocampi not available Seizures
Known or imaging suspicion of neurologic disease known to affect hippocampus
Reported hippocampal abnormalities
Indication for MRI Refractory epilepsy Diplopia, cranial neuropathy, visual dysfunction, optic neuropathy, papilledema, retrobulbar pain, ptosis, ocular findings
MR imaging magnet strength (No.) 3T (36) 1.5T (15) 3T (6) 1.5T (45)
Coronal 2D FLAIR parameters 
    Thickness (mm) 3 3
    FOV (mm) 180 × 180 166 × 190
    TR (ms) 9000–11,000 9000–10,000
    TE (ms) 80–110 80–110
    TI (ms) 2500 2500
    Matrix 256 × 256 256 × 224
Note:—RIS indicates radiology information system.