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AJNR - American Journal of Neuroradiology

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MR Evaluation of the Hippocampus in Patients with Congenital Malformations of the Brain

Noriko Sato^,a, Shinitsu Hatakeyama^a, Nobuzou Shimizu^a, Akio Hikima^a, Jun Aoki^a and Keigo Endo^a

^a From the Departments of Diagnostic Radiology (N.Sa., J.A., K.E.) and Pediatrics (A.H.), Gunma University School of Medicine, Maebashi, Gunma, Japan; and the Departments of Radiology (S.H.) and Pediatrics (N.Sh.), Gunma Children's Medical Center, Hokkitu, Gunma, Japan.

View larger version (93K): [in a new window]   FIG 1. 11-year-old boy with holoprosencephaly. Coronal T1-weighted image (420/15/2) shows bilateral vertically oriented HFs (arrows).FIG 2. One-year-old infant with congenital Fukuyama muscular dystrophy. On coronal FLAIR image (10002/162/1, TI = 2200), neither HF shows inversion (arrows), their configurations are straight and vertical. Both temporal lobes have a smooth cortical surface (lissencephaly) with abnormal low-intensity white matter. Both frontal lobes have shallow sulci

View larger version (73K): [in a new window]   FIG 3. Nine-year-old boy with bilateral polymicrogyria and schizencephaly. Coronal T1-weighted image (420/15/2) shows vertical left HF (thin arrow). Bilateral frontotemporal polymicrogyria (arrowheads) and right schizencephaly (thick arrow) are also present.FIG 4. 23-year-old woman with left temporooccipital heterotopia. Contrast-enhanced coronal 3D-SPGR image (11.2/4.2/1, flip angle = 45°) shows left hippocampal formation, located medially and globular in shape (arrow), with asymmetrically dilated inferior horn of left lateral ventricle (arrowhead).FIG 5. One-month-old baby with tuberous sclerosis. Coronal 3D-SPGR image (14.2/5.5/1, flip angle = 45°) shows both HFs are small and vertical (arrows). Tiny high-intensity subependymal tubers (arrowhead) are also evident