Hallervorden-Spatz syndrome and MRI: the "tiger's eye". One case.

The MRI exploration of a woman suspected, on clinical grounds, of having Hallervorden-Spatz disease (or rather syndrome) revealed, on T2-weighted sequences, the "tiger's eye" or "target" image of the pallidum described by previous authors: i.e. a high-intensity signal in the centre of a distinct low-intensity signal; it also showed an abnormal low-intensity signal of the substantia nigra.

Epileptogenic cerebral vascular malformations and MRI.

The results of magnetic resonance imaging (MRI) performed in 67 patients with cerebral vascular malformations (35 arteriovenous malformations [AVM], 29 cryptic malformations, 11 venous angiomas and 2 associated lesions) were studied retrospectively after the patient population was divided into epileptics [25] and non-epileptics [42]. Several criteria were determined for each type of malformation in the two groups. They included patient's age, site of the malformation in relation to the cortex, size of the malformation, presence of a perilesional high-intensity signal on T2-weighted sequences and evidence of recent haemorrhage.