[Paraspinal arteriovenous malformations with perimedullary venous drainage].

Symptoms of chronic myelopathy in cases of paraspinal arteriovenous malformations are most often related to perimedullary venous drainage. Here, we report on three cases of such malformations that have unique epidural venous drainage. These thoracolumbar lesions manifested as isolated back pain (in two cases) and S1 lumboradicular pain (in one case).

Thalamic tremor: correlations with three-dimensional magnetic resonance imaging data and pathophysiological mechanisms.

Tremor associated with a single focal thalamic lesion has rarely been reported. Furthermore, the exact localization of the lesions is difficult to determine because of the imprecision of "conventional" radiology (computed tomography scan and/or "standard" magnetic resonance imaging). The aim of this study was to identify which thalamic structures are involved in tremor associated with a single focal thalamic lesion.

Gadolinium-enhanced fast three-dimensional angiography of the neck: technical aspect.

Rational And Objectives: This study sought to assess the feasibility of a contrast-enhanced three-dimensional (3D) magnetic resonance (MR) angiographic sequence for imaging the cervical arteries.

Methods: Ninety-eight consecutive patients underwent contrast MR angiography using a 3D sequence in the coronal plane, including both carotid and vertebral arteries. Gadolinium was injected at the beginning of the sequence.

Dystonia after striatopallidal and thalamic stroke: clinicoradiological correlations and pathophysiological mechanisms.

Objective: To establish the pathophysiological mechanisms of striatopallidal and thalamic dystonia.

Methods: Five patients from among 26 who presented (between March 1987 and July 1996) with focal dystonia, segmental dystonia, or hemidystonia caused by a single localised vascular lesion, were selected. Patients with lesions with indefinite boundaries, and diffuse, or multiple, or large brain lesions were excluded.

Contrast-enhanced three-dimensional fast imaging with steady-state precession (FISP) MR angiography of supraaortic vessels: preliminary results.

Background And Purpose: The purpose of this study was to assess the effectiveness of contrast-enhanced fast three-dimensional (3D) MR angiography in depicting both the carotid and vertebral arteries in their cervical portions and to compare MR angiography with conventional angiography for the evaluation of arteriosclerotic disease.

Methods: Twenty-seven patients with ischemic cerebral events in the anterior (n = 18) and posterior (n = 9) circulation underwent contrast-enhanced 3D MR angiography in the coronal plane. MR angiograms were examined in a blinded fashion by two observers independently.

[Contribution of fast-sequence three-dimensional MRI angiography with Gadolinium injection in the evaluation of supra-aortic vessels].

Sixty-nine patients with cervical atherosclerotic disease were evaluated by Magnetic Resonance (MR) angiography using a coronal 3D gradient echo gadolinium enhanced sequence. The image quality was evaluated for each artery and ostium on MIP reconstructions. A comparison with conventional angiography was achieved in 27 patients.

Helical CT for the follow-up of cervical internal carotid artery dissections.

Purpose: The aim of this study was to assess the changes over time of internal carotid artery (ICA) dissections by using helical CT.

Methods: Twenty-seven patients with 30 angiographically proved ICA dissections were followed up with helical CT at 7 to 62 months (median, 24 months) after conventional angiography. CT scans, analyzed independently by two radiologists in a blinded fashion, were evaluated for the presence of mural thickening, aneurysmal formation, and arterial occlusion.

Lumbar spinal cord motion measurement with phase-contrast MR imaging in normal children and in children with spinal lipomas.

We assessed the normal movement of the lumbar spinal cord using phase-contrast MR imaging, and also the movement of the spinal cord in patients with spinal lipoma pre- and postoperatively. Phase-contrast MR imaging proved to be a valuable tool in this context.

Solitary cystic lymphangioma.

A young girl had a large isolated and localized multicystic lesion of the right humerus, which was revealed by a pathological fracture. MRI and bone biopsy showed liquid-filled bone cysts. The final diagnosis was localized cystic lymphangiomatosis.

Plant allelochemicals and insect parasitoids effects of nicotine onCotesia congregata (say) (Hymenoptera: Braconidae) andHyposoter annulipes (Cresson) (Hymenoptera: Ichneumonidae).

Parasitoids developing within tobacco hornworms or fall army-worms exhibit significant differences in development and survival depending on whether their hosts fed on nicotine-free or nicotine-containing diets. The effects of nicotine were more severe on the relatively less adapted parasitoid,H. annulipes than the specialist parasitoid,Cotesia congregata.